Refactor: detect deleted cached files subset on a timer

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@52bfae1). Learn more about missing BASE report.

Files	Patch %	Lines
src/types/files/fileCache.ts	14.28%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1157 +/- ## ======================================= Coverage ? 93.11% ======================================= Files ? 102 Lines ? 6376 Branches ? 1410 ======================================= Hits ? 5937 Misses ? 438 Partials ? 1 ```

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:test_tube: Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/cache-delete-timer" [commands..] [options]

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