Reland "Support lookup of tests by name"

This reverts commit db9cd69bb81fb041c5d67f92b46c1c258c25404e.

Reason for revert: Includes fix to not use ripgrep when it's not installed.

Original change's description:
> Revert "Support lookup of tests by name"
>
> This reverts commit 06cca53131af2ffda2fa83a3cdd7a1662bdc3b5b.
>
> Reason for revert: FileNotFoundError: [Errno 2] No such file or directory: 'rg'
>
> Original change's description:
> > Support lookup of tests by name
> >
> > Adds --name to search for and runs a test by name.
> > Also changes the behavior of positional parameters to autotest.py.
> > If a parameter looks like a file or directory, it is treated like
> > a test file/directory. Otherwise, it is treated like a --name
> > argument.
> >
> > Change-Id: I7075a30a0c6879ffadeb3ef71401d0d36a6a6964
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7064792
> > Reviewed-by: Andrew Grieve <[email protected]>
> > Commit-Queue: Dan Harrington <[email protected]>
> > Cr-Commit-Position: refs/heads/main@{#1533821}
>
> Bug: 454409349
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Change-Id: I8a4767d465dcc60657a1aa4b667a3accdc7a5762
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7076776
> Owners-Override: Henrique Nakashima <[email protected]>
> Auto-Submit: Henrique Nakashima <[email protected]>
> Bot-Commit: Rubber Stamper <[email protected]>
> Commit-Queue: Dan Harrington <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#1533931}

Bug: 454409349
Change-Id: Ie85bb0c43d355fb2b43086e05c58008c7ea5dfff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7075934
Reviewed-by: Andrew Grieve <[email protected]>
Commit-Queue: Dan Harrington <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1534374}

• tools/autotest.py[diff]