Mitigation for remote snapshot filecache overflow

[finnegancarroll]

Description

Remote snapshot file_cache does not strictly limit it's disk usage to its configured capacity. This change causes subsequent requests to the file cache to fail when the cache overflows. #11676 for more details.

Related Issues

Mitigation for #11676

Check List

• [x] Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

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