fix(app, android): clear stale custom auth domains

[OskarEichler]

Fixes

• Clear a secondary app’s cached custom authDomain after successful deletion, preventing a later app with the same name from inheriting stale configuration.
• Make the shared auth-domain cache thread-safe for bridge and serialization access.
• Read each cached domain once while serializing app options.

Verification

• Added a regression assertion to the existing Android delete-app unit test; it failed before the fix and passes after it.
• :packages:app:testDebugUnitTest
• :packages:app:assembleDebug
• :packages:app:lintDebug (only the four existing generated-spec StringFormatTrivial warnings)
• yarn lint:android formatter completed with no additional formatting changes; its diff guard sees only this intentional native patch.
• yarn tests:jest --runInBand (104 suites, 1,480 tests)
• yarn tsc:compile
• yarn tsc:compile:consumer
• yarn lint:deps
• yarn reference:api
• yarn compare:types
• git diff --check

Compatibility

No public JavaScript, TypeScript, native module, or generated-spec API changes.

[OskarEichler]

I re-reviewed this PR against the current main branch and found that its branch had accidentally included the preceding PR's commit. I have force-updated the branch so the PR now contains only its intended three-file change:

• make the Android auth-domain cache concurrency-safe;
• clear the cached auth domain after a successful app deletion;
• avoid the duplicate cache lookup while serializing app options;
• cover both the cached and absent serializer paths, as well as deletion cleanup.

The final implementation is intentionally small: 31 insertions and 3 deletions across the two production files and one existing JVM test file. I did not find further simplifications that would preserve the lifecycle behavior and thread safety.

Validation completed on the frozen production diff:

• canonical Android Java formatter: pass
• Android JVM unit suite: pass
• merged JaCoCo report: 100% on all reachable touched executable lines and both touched branches
• Android build: pass
• Android app-area e2e: 39 passing
• iOS build and app-area e2e: 39 passing
• macOS build and app-area e2e: 33 passing
• git diff --check: pass

The branch is now a single commit directly on current main.

[mikehardy]

with 41 PRs to process I made a temporary parallel queue processor local for review / triage, gotten through a big chunk already and still chewing on the rest. Hadn't gotten to this one yet, so no worries :-). It'll only pull this updated version. Cheers

[mikehardy]

this one also needs queuing for a look after #9093 lands because it's working in the same area of thread safety for stored handles in maps