[CI] Use single-GPU runners for ROCm MI3xx CI

[jithunnair-amd]

If the job doesn't need >1 GPUs, we can reduce the runner GPU count to 1

cc @jagadish-amd

[pytorch-bot]

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⏳ 13 Pending, 1 Unrelated Failure

As of commit 7613e56 with merge base 8e63472 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• PR Label Check / Check PR Labels (gh) (detected as infra flaky with no log or failing log classifier)

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[jithunnair-amd]

Merging this PR since it successfully scheduled on the 1-GPU runners; the test failures are unrelated to this PR.