test(sdk-core): remove apache-client and netty-nio-client test dependencies

[joviegas]

Motivation and Context

sdk-core depended on apache-client and netty-nio-client at test scope. Those dependencies blocked adding tests for sdk-core behavior to test/http-client-tests: every HTTP client module test-depends on test/http-client-tests, so pointing it at sdk-core closes the cycle sdk-core -> apache-client -> http-client-tests -> sdk-core, which results Maven build failure with cyclic dependency error.

This PR removes both dependencies, so test/http-client-tests now depends on sdk-core. The eight existing tests that need a real HTTP client move into four suites there, which each client module runs by subclassing.

Modifications

POM files

File	Change
core/sdk-core/pom.xml	Removes the apache-client and netty-nio-client test dependencies.
test/http-client-tests/pom.xml	Adds a compile dependency on sdk-core, required by the relocated test suites.

Deleted

File	Change
sdk-core AmazonHttpClientWireMockTest	Its three tests moved to SdkHttpClientSdkPipelineBehaviorTestSuite.
sdk-core SdkTransactionIdInHeaderTest	Its test moved to SdkHttpClientSdkPipelineBehaviorTestSuite.
sdk-core ContentStreamProviderWireMockTest	Its test moved to SdkHttpClientSdkPipelineBehaviorTestSuite.
sdk-core AmazonHttpClientSslHandshakeTimeoutTest (src/it)	Its test moved to SdkHttpClientSslHandshakeTimeoutTestSuite, which apache-client subclasses as ApacheHttpClientSslHandshakeTimeoutTest.
sdk-core ConnectionPoolMaxConnectionsIntegrationTest (src/it)	Its test moved to SdkHttpClientConnectionPoolTestSuite, which apache-client subclasses as ApacheConnectionPoolMaxConnectionsTest.
sdk-core core/http/server/MockServer	Used org.apache.http. Its UNRESPONSIVE and OVERLOADED behaviors were added to the shared MockServer in http-client-tests, leaving one implementation instead of two.
sdk-core UnresponsiveMockServerTestBase	Its only consumer was the SSL handshake test. SdkHttpClientSslHandshakeTimeoutTestSuite now starts the mock server itself.
sdk-core MockServerTestBase	Its only subclass was UnresponsiveMockServerTestBase.

Modified

File	Change
sdk-core ClasspathSdkHttpServiceProviderTest	Replaces ApacheSdkHttpService and NettySdkAsyncHttpService with two test-local service implementations. The provider selects implementations by class name from a priority map, so the real classes are not required. All four scenarios are unchanged.
sdk-core utils/HttpTestUtils	testSdkHttpClient() and testSdkAsyncHttpClient() return the new stub clients instead of loading Apache or Netty through ServiceLoader. The remaining methods are unchanged.
sdk-core HttpClientApiCallTimeoutTest	Drops the WireMock rule and stubs, and passes StubSdkHttpClient to the client builder. Error-path cases build a second client that returns a 500 status. Stays on JUnit 4 with the original sleep values and assertions.
sdk-core HttpClientApiCallAttemptTimeoutTest	Same change as HttpClientApiCallTimeoutTest.
sdk-core AsyncHttpClientApiCallTimeoutTests	Same change, using StubSdkAsyncHttpClient. The slowApiAttempt test moved to SdkAsyncHttpClientApiCallAttemptTimeoutTestSuite, because it needs a delayed response from a real server.
http-client-tests http/server/MockServer	Adds the UNRESPONSIVE and OVERLOADED behaviors and a non-TLS startServer(), ported from the deleted sdk-core copy. Existing behaviors and the TLS startServer overload are unchanged.

Added

File	Change
sdk-core utils/StubSdkHttpClient	In-memory SdkHttpClient that returns a configurable status code without opening a socket. Replaces the ServiceLoader-provided Apache client in tests.
sdk-core utils/StubSdkAsyncHttpClient	Async equivalent, replacing the ServiceLoader-provided Netty client.
http-client-tests SdkHttpClientSdkPipelineBehaviorTestSuite	Abstract suite holding the five relocated sync tests. Subclasses provide the client through createSdkHttpClient().
http-client-tests SdkAsyncHttpClientApiCallAttemptTimeoutTestSuite	Abstract suite holding the relocated slowApiAttempt test.
http-client-tests SdkHttpClientConnectionPoolTestSuite	Abstract suite holding the relocated connection pool test. Applies to sync clients that expose maxConnections, which is apache-client and apache5-client. Subclasses supply the client and the exception their HTTP library raises on pool exhaustion.
http-client-tests SdkHttpClientSslHandshakeTimeoutTestSuite	Abstract suite holding the relocated SSL handshake timeout test. Applies to sync clients that expose a socket timeout, which is apache-client, apache5-client and url-connection-client. Subclasses supply the client.
apache-client ApacheHttpClientSdkPipelineBehaviorTest	Runs the sync suite against ApacheHttpClient.
netty-nio-client NettyNioAsyncHttpClientApiCallAttemptTimeoutTest	Runs the async suite against NettyNioAsyncHttpClient.
apache-client ApacheHttpClientSslHandshakeTimeoutTest	Subclass of SdkHttpClientSslHandshakeTimeoutTestSuite. Supplies an ApacheHttpClient with the socket timeout the suite asks for.
apache-client ApacheConnectionPoolMaxConnectionsTest	Subclass of SdkHttpClientConnectionPoolTestSuite. Supplies an ApacheHttpClient with maxConnections(1) and names ConnectionPoolTimeoutException as the expected cause.
http-client-tests utils/HttpTestUtils	Copy of the sdk-core helper, without the ServiceLoader factory methods, so callers pass a client explicitly. Also holds executionContext(...).
http-client-tests utils/ValidSdkObjects	Copy of the sdk-core helper, same package.
http-client-tests utils/http/WireMockTestBase	Copy of the sdk-core helper, same package.
http-client-tests core/http/NoopTestRequest	Copy of the sdk-core helper, same package.
http-client-tests internal/util/ResponseHandlerTestUtils	Copy of the sdk-core helper, same package.
http-client-tests internal/util/AsyncResponseHandlerTestUtils	Copy of the sdk-core helper, same package.
http-client-tests internal/http/response/NullErrorResponseHandler	Copy of the sdk-core helper, same package.
http-client-tests internal/http/response/EmptySdkResponseHandler	Copy of the sdk-core helper, same package. Used by the relocated connection pool test.

The helpers are copies because the relocated tests drive the sdk-core execution pipeline, and this repository does not
publish test-jars, so http-client-tests cannot reference classes under sdk-core/src/test.

License

• I confirm that this pull request can be released under the Apache 2 license

[jencymaryjoseph]

nit : interceptor* typo