Revert "remove underscores in test names //ash"

This reverts commit 3c77753b81f9f0d71805d7120b45f46f3c5d4f4c.

Reason: https://groups.google.com/a/chromium.org/g/chromium-dev/c/KxzyXKv7adQ

Based on the discussion here, I have decided to terminate this work.

Bug: 377144451
Change-Id: I9171c3f47e728b23c5c1d38d4b638b18e6b0568a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6065878
Commit-Queue: Ho Cheung <hocheung@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Hugo Benichi <hugobenichi@google.com>
Cr-Commit-Position: refs/heads/main@{#1390804}