[copybara-service]

Configure AndroidX Test API generation for annotations and
--ignore-comments.

Configure Metalava and Dackka in androidx.test to hide internal APIs
via annotations and package filters instead of @hide Javadoc tags,
and enable --ignore-comments on API signature generation.

• Annotate internal classes missing visibility annotations
  (ProcSummary, DefaultInterceptingActivityFactory,
  InstrumentationParameterUtil, PortForwardingRule.Builder, and
  TestOutputHandler) so API surface checks hide them without relying
  on @hide doc tags.
• Add --ignore-comments and --hide-annotation entries for
  androidx.annotation.RestrictTo and HideFromApi in
  generate_api.bzl, plus matching hidingAnnotations in dackka.bzl.
• Add hide_packages / excluded_packages support for
  androidx.test.services.storage while its @RestrictTo annotations
  remain stripped in internal builds, and remove @hide from those
  storage classes.
• Update espresso and monitor current_public.txt signature files
  for newly hidden @RestrictTo(LIBRARY_GROUP) AIDL interfaces and
  ExposedInstrumentationApi superclass elision.

Using visibility annotations instead of @hide doc tags:

• Unlocks passing --ignore-comments on API signature generation,
  improving build performance and memory usage by skipping Javadoc/KDoc
  extraction, comment AST parsing, and {@link} import caching.
• Enables Metalava declarative <api-surfaces> XML configuration,
  which ignores @hide and @removed Javadoc tags by design.
• Replaces unchecked Javadoc comments with compiler-, Lint-, and
  IDE-enforced @RestrictTo visibility restrictions.