CI: disable trunk jobs on PR

[digantdesai]

This is effectively the same state as before.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14177

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❌ 4 New Failures, 23 Pending, 2 Unrelated Failures

As of commit 45f5d31 with merge base 66639e4 ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-llama_runner_eager-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-llava-runner-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory
• pull / test-mediatek-models-linux / linux-job (gh)
  An error occurred trying to start process '/usr/bin/bash' with working directory '/home/ec2-user/actions-runner/_work/executorch/executorch/pytorch/executorch'. No such file or directory

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

• pull / test-llama-lora-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-phi-3-mini-runner-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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