Add _[no]red suffix to RampUpTests.
Add _[no]red suffix to RampUpTests.

For the RampUpTest.UpDownUpAbsSendTimeSimulcastRedRtx and
RampUpTest.UpDownUpTransportSequenceNumberRtx [1,2], the generated metric names
are the same:

- ramp_up_down_up_3streams_rtx.first_rampup
- ramp_up_down_up_3streams_rtx.second_rampup
- ramp_up_down_up_3streams_rtx.rampdown

So only one of the two tests (whichever ran last) has its metrics reported to
the perf dashboard, while the others has its metrics ignored.

[1] https://webrtc.googlesource.com/src/+/master/call/rampup_tests.cc#571
[2] https://webrtc.googlesource.com/src/+/master/call/rampup_tests.cc#579

Bug: webrtc:8691
Change-Id: I632dfe32d3b4729f1b0233c44d03c2894ee8c027
Reviewed-on: https://webrtc-review.googlesource.com/36941
Reviewed-by: Patrik Höglund <b486136ee68458b09c92c86c39f451c87d6ef6a1@webrtc.org>
Reviewed-by: Henrik Andreassson <e468f06af92d21183a2a635f545ff5cefc8c8b65@webrtc.org>
Commit-Queue: Edward Lemur <d05609f027dc667cc37492b1dc1bdea5d60fa82a@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#21499}
ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc