[tests] Share + shrink api-24.xml.in fixture (~56 MiB → 393 KB)

[jonathanpeppers]

The two api-24.xml.in files under tests/ were each ~28 MiB (56 MiB total in the repo) and nearly identical — only 5 annotated-visibility="TESTS" markers (used by JavaTypeModelsTests.AnnotatedVisibility) differed.

This PR consolidates them into a single shared file under tests/TestData/ and trims it down to ~393 KB (685 of the original 3,823 types). All 30 tests still pass:

• Java.Interop.Tools.JavaTypeSystem-Tests: 17/17
• Xamarin.Android.Tools.ApiXmlAdjuster-Tests: 13/13

Changes

• Move tests/Java.Interop.Tools.JavaTypeSystem-Tests/api-24.xml.in → tests/TestData/api-24.xml.in (preserves the TESTS annotations).
• Delete the duplicate under tests/Xamarin.Android.Tools.ApiXmlAdjuster-Tests/.
• Point both JavaApiTestHelper.cs files at the shared path.
• Xamarin.Android.Tools.ApiXmlAdjuster's loader does not recognize annotated-visibility, so its helper strips that attribute in-memory before parsing.
• Trim the shared XML to the transitive type-resolution closure required by the test assertions, then strip <method>, <field>, and <constructor> bodies from types whose bodies no test inspects. Bodies are kept only on a small allowlist:
  • android.database.ContentObservable + android.database.Observable — generic registerObserver mapping
  • java.util.concurrent.ConcurrentHashMap — searchEntries generic resolution
  • android.app.Activity — addContentView BaseMethod lookup
  • android.animation.StateListAnimator, android.drm.DrmStore.ConstraintsColumns — AnnotatedVisibility

Result

	Before	After
Files	2 × ~28 MiB	1 × ~393 KB
Types	3,823	685
Tests	30/30 ✅	30/30 ✅

Net diff: 5 files changed, 2637 insertions(+), 2087250 deletions(-).

[Copilot]

Pull request overview

Consolidates and significantly shrinks the api-24.xml.in test fixture so multiple test projects can share a single, much smaller API surface while preserving the few annotated-visibility="TESTS" markers needed by JavaTypeModelsTests.AnnotatedVisibility.

Changes:

• Move to a shared fixture at tests/TestData/api-24.xml.in and trim it to the minimal transitive closure needed by assertions.
• Remove the duplicate api-24.xml.in from tests/Xamarin.Android.Tools.ApiXmlAdjuster-Tests/.
• Update both test helpers to load the shared fixture; ApiXmlAdjuster tests strip annotated-visibility before parsing.

Reviewed changes

Copilot reviewed 2 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/TestData/api-24.xml.in	New shared, trimmed api-24 fixture (keeps a small number of annotated-visibility="TESTS" markers).
tests/Java.Interop.Tools.JavaTypeSystem-Tests/JavaApiTestHelper.cs	Points JavaTypeSystem tests at the shared fixture path.
tests/Xamarin.Android.Tools.ApiXmlAdjuster-Tests/JavaApiTestHelper.cs	Points ApiXmlAdjuster tests at the shared fixture and strips annotated-visibility before loading.
tests/Java.Interop.Tools.JavaTypeSystem-Tests/api-24.xml.in	Removed/moved in favor of the shared tests/TestData fixture.
tests/Xamarin.Android.Tools.ApiXmlAdjuster-Tests/api-24.xml.in	Removed duplicate fixture now replaced by shared tests/TestData copy.

[jonathanpeppers]

I was going to fix this, but the GitHub app is freezing up because the diff is so large.

I think this is "good enough" and we can fix in the future if needed.

I mainly want to get this in, to improve the diff size at:

• Merge dotnet/java-interop into external/Java.Interop with full history android#11744