exir: enable exir test targets in OSS buck2 CI build

[mergennachin]

Switch python_unittest to runtime.python_test across exir/ test BUCK
files so deps get //executorch/ path rewriting and //caffe2 stripping
for OSS buck2. Add supports_static_listing to the unsupported kwargs
list in env_interface.bzl so runtime.python_test can handle that
fbcode-only kwarg.

This enables buck2 build (not test) of 12 exir test targets in CI,
up from 3 previously.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17589

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❌ 3 New Failures

As of commit bc0347f with merge base 1dffefd ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/opt/android/sdk/platform-tools/adb' failed with exit code 224
• pull / test-openvino-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 53aa97d27e79de9db65cf12cd23111079ff0f453c7e8a978b50e38736b7ee552 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 08c271a4e59ef7415d00af64666f1a612dbce1fd81ca801c2e7fc12407e61f29 /exec failed with exit code 4

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[Copilot]

Pull request overview

This PR updates the build configuration for the test_flatbuffer test to enable it in the buck2 CI build pipeline. The test is switched from python_unittest to runtime.python_test to support OSS (Open Source Software) dependency path rewriting, and is added to the buck2 CI script's build-only section.

Changes:

• Modified test_flatbuffer target to use runtime.python_test instead of python_unittest for OSS dependency path rewriting
• Added test_flatbuffer to the buck2 CI build-only targets list

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
exir/_serialize/test/BUCK	Updated test_flatbuffer from python_unittest to runtime.python_test and imported runtime module
.ci/scripts/unittest-buck2.sh	Added test_flatbuffer to the build-only section of buck2 CI

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (2)

exir/program/test/BUCK:2

• The python_unittest import is unused since all tests in this file have been converted to runtime.python_test. Consider removing this import to keep the file clean.

load("@fbcode_macros//build_defs:python_unittest.bzl", "python_unittest")

exir/emit/test/BUCK:2

• The python_unittest import is unused since the only test in this file has been converted to runtime.python_test. Consider removing this import to keep the file clean.

load("@fbcode_macros//build_defs:python_unittest.bzl", "python_unittest")

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[meta-codesync]

@mergennachin has imported this pull request. If you are a Meta employee, you can view this in D93873553.