Simplify source projection accept() and add more unit tests.

[JonathanLennox]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (a015be9) 44.23% compared to head (0e0591e) 44.27%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2099      +/-   ##
============================================
+ Coverage     44.23%   44.27%   +0.04%     
- Complexity     1927     1930       +3     
============================================
  Files           340      340              
  Lines         18823    18826       +3     
  Branches       2580     2580              
============================================
+ Hits           8327     8336       +9     
+ Misses         9639     9635       -4     
+ Partials        857      855       -2     

Files	Coverage Δ
...rc/main/kotlin/org/jitsi/nlj/rtp/VideoRtpPacket.kt	54.54% <100.00%> (+4.54%)	⬆️
...dge/cc/GenericAdaptiveSourceProjectionContext.java	0.00% <ø> (ø)
...dge/cc/vp8/VP8AdaptiveSourceProjectionContext.java	68.83% <100.00%> (+0.13%)	⬆️
...dge/cc/av1/Av1DDAdaptiveSourceProjectionContext.kt	63.08% <100.00%> (+0.12%)	⬆️
...ridge/cc/vp9/Vp9AdaptiveSourceProjectionContext.kt	66.15% <100.00%> (+0.51%)	⬆️
...jitsi/videobridge/cc/AdaptiveSourceProjection.java	13.33% <0.00%> (+0.14%)	⬆️

... and 1 file with indirect coverage changes

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