GPU is not accessible on some MacOS-15 runners

## Current Status
*ongoing*.

## Error looks like
Jobs running on MacOS-M2-15 timeout after 4 hours, underlying problem is that all attempt to access GPU timeout

## Incident timeline (all times pacific)
*Include when the incident began, when it was detected, mitigated, root caused, and finally closed.*

## User impact
*How does this affect users of PyTorch CI?*

## Root cause
*What was the root cause of this issue?*

## Mitigation
*How did we mitigate the issue?*

## Prevention/followups
*How do we prevent issues like this in the future?*

cc @pytorch/pytorch-dev-infra @aditvenk @snadampal @milpuz01 @aditew01 @nikhil-arm @fadara01 @robert-hardwick @nWEIdia @ezyang @gchanan @kadeng @msaroufim