[RTC-309] RTSP to WebRTC support, minor fixes

[sgfn]

The minor fixes in question are:

• Update upgrading guide to use new repo paths
• Remove StaticTrackSender from hls/test/support/ -- it was supposed to be moved to engine/lib/ in https://github.com/jellyfish-dev/membrane_rtc_engine/pull/300, but the original file was never actually deleted
• Add deps used in modules in integration_test/test/support/ to integration_test/mix.exs
• Move to new H264 parser where able
• Fix Dockerfile used in network condition test

[codecov[bot]]

Codecov Report

Merging #311 (5265a57) into master (ebafff0) will decrease coverage by 0.47%. The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
- Coverage   53.25%   52.79%   -0.47%     
==========================================
  Files          39       38       -1     
  Lines        1983     1970      -13     
==========================================
- Hits         1056     1040      -16     
- Misses        927      930       +3     

Files Changed	Coverage Δ
hls/test/support/file_source_endpoint.ex	93.10% <ø> (+10.34%)	:arrow_up:
rtsp/lib/rtsp_endpoint.ex	58.46% <0.00%> (-7.06%)	:arrow_down:
hls/lib/hls_endpoint.ex	50.42% <50.00%> (-1.20%)	:arrow_down:

... and 2 files with indirect coverage changes

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