[RELEASE ONLY CHANGES] Apply release workflow changes for 1.0

[GregoryComer]

Summary

As described in the release manual, I've run TEST_INFRA_BRANCH=release/2.9 scripts/release/apply-release-changes.sh to update workflows to use the release/2.9 test infra branch.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14390

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❌ 3 New Failures, 2 Cancelled Jobs, 5 Unrelated Failures

As of commit 4fdb1af with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• apple-perf / benchmark-on-device (Qwen/Qwen3-0.6B, et_xnnpack_custom_spda_kv_cache_8da4w, apple_iphone_15, pub... / mobile-job (ios) (gh)
  Final attempt failed. Child_process exited with error code 1
• apple-perf / benchmark-on-device (Qwen/Qwen3-0.6B, hf_xnnpack_custom_spda_kv_cache_8da4w, apple_iphone_15, pub... / mobile-job (ios) (gh)
  Final attempt failed. Child_process exited with error code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e23f1c809840e2f9b585f0fca32122a1ad7017fef099bcbba98548ddc3f5ddcd /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• nightly / backend-test-linux (xnnpack, models) / linux-job (gh)
  ##[error]The operation was canceled.
• nightly / backend-test-macos (coreml_static_int8, operators) / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• nightly / backend-test-linux (qnn_16a16w, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• nightly / backend-test-linux (qnn_16a4w_block, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• nightly / backend-test-linux (qnn_16a4w, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• nightly / backend-test-linux (qnn_16a8w, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• nightly / backend-test-linux (qnn_8a8w, operators) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[psiddh]

Couple of CI failures . unrelated ?

[GregoryComer]

Couple of CI failures . unrelated ?

Yeah, looks like an infra failure. I'm retrying to make sure.

[GregoryComer]

Rebasing and re-running CI. If everything looks good, I'll merge shortly.

[GregoryComer]

Merging as remaining failures are unrelated. This PR triggers basically every workflow. Backend test jobs will be fixed when cherry-picking the larger runner PR.