Revert "Skip HeapTest.GrowAndShrinkNewSpace under tsan"

This reverts commit 97997681.

Reason for revert: Races fixed. Skipping no longer needed.

Original change's description:
> Skip HeapTest.GrowAndShrinkNewSpace under tsan
>
> Bug: v8:13185
> Change-Id: I0c6e4ba8b325c3ac70dbceb927e2a8b1f9d68a16
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3830286
> Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Auto-Submit: Adam Klein <adamk@chromium.org>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/main@{#82449}

Bug: v8:13185
Change-Id: I4e1c117250932358dbd8d09ebe2cc2d331e7236f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3844530
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82618}

test/unittests/unittests.status

@@ -125,10 +125,6 @@
   'LogMapsCodeTest.LogMapsDetailsCode': [SKIP],
   'LogMapsTest.LogMapsDetailsStartup': [SKIP],
   'LogMapsTest.LogMapsDetailsContexts': [SKIP],
-
-  # https://crbug.com/v8/13185
-  # Test sets a flag that's read in another thread by the GC.
-  'HeapTest.GrowAndShrinkNewSpace': [SKIP],
 }],  # tsan == True
 
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