Bug 1875066 [wpt PR 44044] - webrtc wpt: add failing tests for SDP mu…

…nging, a=testonly

Automatic update from web-platform-tests
webrtc wpt: add failing tests for SDP munging

covering both read-only RTCSessionDescription and actual SDP munging.
See also
  w3c/webrtc-pc#2907

BUG=chromium:662898,chromium:823036

Change-Id: Iaabbd131198d18203de4fb7436e4d8c37fb9452e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5204646
Commit-Queue: Philipp Hancke <phanckemicrosoft.com>
Reviewed-by: Harald Alvestrand <htachromium.org>
Cr-Commit-Position: refs/heads/main{#1248758}

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wpt-commits: d38fb52d7074a59d68803b2d211a2a193f78f8bd
wpt-pr: 44044

UltraBlame original commit: 90899997ab4060c1cafc0287db868fc8b7db19ef