Re-enable data-grid resizing test
Re-enable data-grid resizing test

This was flaking on the waterfall; locally I have struggled to reproduce
but have added an extra check to the test which seems to help make it
more stable.

I tested it by running `it.repeat(50, ...)` in STRESS=1 and it didn't
fail once, so hopefully it will behave itself on the bots...

Bug: chromium:1172902
Change-Id: I25ad1572d63ff3e438df41bad1b0c62f38578d16
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2667189
Reviewed-by: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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