Revert "[test] Skip flaking test"

This reverts commit 0a5fcd8a.

Reason for revert: reenable TSAN test after moving best_fit out from stage

Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_isolates_rel_ng,v8_linux64_tsan_no_cm_rel_ng,v8_linux64_tsan_rel_ng,v8_numfuzz_tsan_ng;luci.chromium.try:linux_chromium_tsan_rel_ng,linux_chromium_tsan_rel_ng-compilator

Original change's description:
> [test] Skip flaking test
>
> Bug: v8:12697
> Change-Id: I124f2f0fd3c98d6a5233a0e2a8236a2b15d791fd
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3532261
> Auto-Submit: Manos Koukoutos <manoskouk@chromium.org>
> Reviewed-by: Victor Gomes <victorgomes@chromium.org>
> Commit-Queue: Victor Gomes <victorgomes@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79518}

Bug: v8:12697
Change-Id: I53d109674ecd938d8be915099c412d174600edfc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3624464
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80346}

test/mjsunit/mjsunit.status

@@ -131,13 +131,10 @@
   # https://crbug.com/v8/10948
   'wasm/atomics': [PASS, ['arch == arm and not simulator_run', SKIP]],
 
-  # https://crbug.com/v8/12472 Stack overflow during regexp node generation.
+  # crbug.com/v8/12472 Stack overflow during regexp node generation.
   'regress/regress-crbug-595657': [SKIP],
   'regress/regress-475705': [SKIP],
 
-  # https://crbug.com/v8/12697
-  'math-abs': [SKIP],
-
   ##############################################################################
   # Tests where variants make no sense.
   'd8/enable-tracing': [PASS, NO_VARIANTS],