fix: toLowerCase keyIds from manifest and use fastQualityChange

[adrums86]

Description

Manifests with uppercase keyIds were not matching with keyIds coming from the MediaKeyStatusMap. Also occasionally we would buffer encrypted content that we may not have a key for, we need to call fastQualityChange to clear the buffer before switching playlists.

Specific Changes proposed

Add toLowerCase to the keyId from the manifest when passing the keyIdSet for playlist filtering and call fastQualityChange instead of switchMedia then fix tests.

Requirements Checklist

• [x] Feature implemented / Bug fixed
• [ ] If necessary, more likely in a feature request than a bug fix
  • [ ] Unit Tests updated or fixed
  • [ ] Docs/guides updated
  • [ ] Example created (starter template on JSBin)
• [ ] Reviewed by Two Core Contributors

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2878b27) 86.03% compared to head (533e821) 86.02%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1466 +/- ## ========================================== - Coverage 86.03% 86.02% -0.01% ========================================== Files 42 42 Lines 10712 10708 -4 Branches 2462 2461 -1 ========================================== - Hits 9216 9212 -4 Misses 1496 1496 ```

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