Add executorch-et-log-disabled constraint honored by log.bzl (#20187)

[JakeStevens]

Summary:

Adds support to disable logging using BUCK constraint

Reviewed By: rascani

Differential Revision: D108152661

[github-actions]

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20187

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit 47eb92f with merge base f0dff03 ():

NEW FAILURE - The following job has failed:

• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 74da49adee8c713ef436dfe20fdf19815ac555042326f58e7e100b46ddc39b86 /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / unittest-nxp-neutron / linux-job (gh)

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / build-android (gh) (trunk failure)
  Process completed with exit code 1.

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