Fix Android emulator CI test file permission error

[mergennachin]

This test has been failing for a while: https://hud.pytorch.org/hud/pytorch/executorch/main/1?per_page=50&name_filter=android%20%2F%20run-emulator

Use internal cache directory instead of external cache directory for
Android instrumentation tests. On Android API 34, scoped storage
restrictions prevent writing to external storage even for app-specific
directories. Internal storage (cacheDir) requires no permissions and
works reliably on all API levels.

• Change externalCacheDir to cacheDir in TestFileUtils
• Remove unnecessary READ_EXTERNAL_STORAGE permission from manifest
• Remove GrantPermissionRule from all test files

Test Plan:

https://github.com/pytorch/executorch/actions/runs/21071703747

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16649

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❌ 1 New Failure, 32 Pending, 1 Unrelated Failure

As of commit 76c55b2 with merge base 8887cfd ():

NEW FAILURE - The following job has failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t a4ae955bbf59f840da6eb8fbdc3bf91f9847285322f72700f29e0476627eb3d9 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test Metal Backend / export-model-metal-artifact (openai, whisper-small, non-quantized) / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

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[Copilot]

Pull request overview

This PR fixes Android emulator CI test file permission errors on Android API 34 by switching from external to internal cache storage. On Android API 34, scoped storage restrictions prevent writing to external storage directories, even for app-specific ones. Internal storage (cacheDir) works reliably across all API levels without requiring permissions.

Changes:

• Modified TestFileUtils.getTestFilePath() to use cacheDir instead of externalCacheDir
• Removed READ_EXTERNAL_STORAGE permission from test manifest
• Removed GrantPermissionRule and related imports from all test files

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/TestFileUtils.kt	Changed from externalCacheDir to cacheDir for file path generation
extension/android/executorch_android/src/androidTest/AndroidManifest.xml	Removed READ_EXTERNAL_STORAGE permission declaration
extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/training/TrainingModuleE2ETest.kt	Removed GrantPermissionRule and related imports
extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/ModuleInstrumentationTest.kt	Removed GrantPermissionRule and related imports
extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/ModuleE2ETest.kt	Removed GrantPermissionRule and related imports
extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/LlmModuleInstrumentationTest.kt	Removed GrantPermissionRule and related imports

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