Run multimodal CI under batch gdb

[GregoryComer]

Summary

Trying to debug a sporadic segfault in CI that I can't repro locally.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19608

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• Run pull request jobs on OSDC runners in shadow mode

❌ 1 New Failure, 1 Unclassified Failure

As of commit 69f3609 with merge base 4c474af ():

NEW FAILURE - The following job has failed:

• pull / unittest / windows / windows-job (gh)
  Process completed with exit code 1.

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• Check Labels / Check labels (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: GraphQL query

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