[7.3.0] Enforce and await cleanup in StarlarkBaseExternalContext
#22883
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`StarlarkBaseExternalContext` now implements `AutoCloseable` and, in `close()`: 1. Cancels all pending async tasks. 2. Awaits their termination. 3. Cleans up the working directory (always for module extensions, on failure for repo rules). 4. Fails if there were pending async tasks in an otherwise successful evaluation. Previously, module extensions didn't do any of those. Repo rules did 1 and 4 and sometimes 3, but not in all cases. This change required replacing the fixed-size thread pool in `DownloadManager` with virtual threads, thereby resolving a TODO about not using a fixed-size thread pool for the `GrpcRemoteDownloader`. Work towards bazelbuild#22680 Work towards bazelbuild#22748 Closes bazelbuild#22772. PiperOrigin-RevId: 644669599 Change-Id: Ib71e5bf346830b92277ac2bd473e11c834cb2624
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StarlarkBaseExternalContextnow implementsAutoCloseableand, inclose():Previously, module extensions didn't do any of those. Repo rules did 1 and 4 and sometimes 3, but not in all cases.
This change required replacing the fixed-size thread pool in
DownloadManagerwith virtual threads, thereby resolving a TODO about not using a fixed-size thread pool for theGrpcRemoteDownloader.Work towards #22680
Work towards #22748
Closes #22772.
PiperOrigin-RevId: 644669599
Change-Id: Ib71e5bf346830b92277ac2bd473e11c834cb2624
Closes #22776