[Unit tests] Show skipped tests instead of painting them green.
[Unit tests] Show skipped tests instead of painting them green.

Marking test as skipped is more honest than pretending it is successful!
Prevent confusion like in the following scenario for one given test:
  - ubsan: launched and sometimes failing.
  - tsan: never launched but always flagged OK.

Bug: webrtc:9778
Change-Id: Ie0be0759347eabd3c9d29dd5ea2de809511d1b97
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145980
Reviewed-by: Henrik Andreassson <e468f06af92d21183a2a635f545ff5cefc8c8b65@webrtc.org>
Reviewed-by: Sami Kalliomäki <b9debeb8943b89663e00c95863751401cba91c9a@webrtc.org>
Commit-Queue: Yves Gerey <0554266f02d7ad5bb902ac47b1c8525c05c3857c@google.com>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28597}

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