fix: keyId filtering loadedplaylist listener and improvements

[adrums86]

Description

After doing some further testing with HLS and playlist exclusion by keyId, it became apparent some more fixes were needed to properly request and filter all possible variants.

I also added a fallback mechanism and additional logging. I was testing another asset with no matching keys and it seemed necessary to at least TRY and play the non-HD playlists if we have previously excluded them due to non-usable or non-matching keyIds.

Specific Changes proposed

Listening to loadedplaylist and calling excludeNonUsablePlaylistsByKeyId_ and fastQualityChange when a new playlist is loaded. This allows the playlist-controller to check the keyId in the loaded or refreshed playlist for an HLS variant, or a refreshed DASH manifest.

Also, add a conditional after the playlist exclusion loop that checks if we excluded all of the playlists due to non-usable status or non-matching keys and re-includes all the SD playlists and logs a warning. This provides VHS with a bit more resilience against unexpected manifests or license data.

Requirements Checklist

• 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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (88a5671) 86.02% compared to head (4eeafc5) 86.12%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1468      +/-   ##
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+ Coverage   86.02%   86.12%   +0.09%     
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  Files          42       42              
  Lines       10708    10781      +73     
  Branches     2461     2490      +29     
==========================================
+ Hits         9212     9285      +73     
  Misses       1496     1496              

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[wseymour15]

This makes sense to me, I think falling back is valuable when we can do it.