fix: Handle empty API keys with no-op client

[marandaneto]

Summary

• initialize PostHog with a disabled no-op consumer when the API key is missing, null, empty, or trim-empty
• avoid sending capture/flag requests with an empty api_key
• add focused coverage for PostHog::init() and direct Client construction

Tests

• ./vendor/bin/phpunit --no-coverage --filter 'testInitWithoutApiKeyConfiguresNoOpClient|testInitWithEmptyApiKeyConfiguresNoOpClient|testInitWithWhitespaceApiKeyConfiguresNoOpClient|testClientWithNullApiKeyDoesNotSendRequests|testClientWithTrimEmptyApiKeyDoesNotSendRequests' test/PostHogTest.php\n- ./vendor/bin/phpunit --no-coverage (completed with existing warnings/deprecations)

[github-actions]

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[github-actions]

This PR was closed due to lack of activity. Feel free to reopen if it's still relevant.

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
test/PostHogTest.php:247-265
**Prefer parameterised tests for identical cases**

`testInitWithEmptyApiKeyConfiguresNoOpClient` and `testInitWithWhitespaceApiKeyConfiguresNoOpClient` are identical in structure — both call `PostHog::init($apiKey, ["debug" => true])`, assert the `NoOp` consumer, and assert `capture` returns `false`. The only difference is the input value. PHPUnit's `@dataProvider` annotation would express this as a single test with two data sets, removing the duplication and making it trivially easy to add new variants. The same applies to `testClientWithNullApiKeyDoesNotSendRequests` / `testClientWithTrimEmptyApiKeyDoesNotSendRequests`, which share the same three-step assertion pattern.

_{Reviews (1): Last reviewed commit: "fix: report disabled no-op calls as fals..." | Re-trigger Greptile}

[ioannisj]

LG, left a couple of comments that make sense to me