This is a pure rename+move of PeerConnectionSimulcastMediaFlowTests.
The reason for renaming is to reflect that a) this is an integration
test, not a unit test, and b) not all of the tests use simulcast (some
use a single encoding, i.e. singlecast or SVC).
Shared helper functions between PeerConnectionEncodingsIntegrationTest
and PeerConnectionSimulcastTests are placed in a test-only util file.
# Already pass, no need to wait for chromium bots for webrtc testonly CL
NOTRY=True
Bug: webrtc:15063
Change-Id: Iec90d1a7ab712be1395c7644723422c8c6179974
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/300540
Reviewed-by: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39799}
