Revert "[infra] No task deduplication"

This reverts commit 326ad9e716d3a5006abb03bd3399f8c4222414f3.

Reason for revert: This was an outage of some kind, not intentional expiration of isolates.

Original change's description:
> [infra] No task deduplication
> 
> Isolates are expiring despite the tasks which generate them being
> deduped. Hopefully this is temporary, and we can update the isolate
> server to expire based on last usage date rather than creation date.
> 
> Change-Id: I7158612cd9b28c80268c54da9af88d2048e6aad1
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226176
> Reviewed-by: Ravi Mistry <rmistry@google.com>
> Commit-Queue: Eric Boren <borenet@google.com>

TBR=borenet@google.com,rmistry@google.com

Change-Id: I3afc8e9e89174505d87d96d45ab6c9e44937bb29
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226219
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed