Github + OPFS delete + OPFS tests

[nickcastel50]

This PR adds code (currently not hooked up to UI) for deleting models from OPFS and GitHub. It also adds a utility function to check to see if a file exists in OPFS.

Additionally, tests have been added for all OPFS related functions and the service worker has been mocked.

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Lighthouse	1 paths audited Performance: 25 (🔴 down 1 from production) Accessibility: 80 (no change from production) Best Practices: 92 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ HttpError: Not Found getLatestCommitHash(src/utils/GitHub) View Issue

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