migrate the glicActor policy control exemption param from chrome_features to glic/features

- creates a new feature flag in glic/features.
- migrates the tests accordingly.

Change-Id: I1962ab76358617b654c2e7f616f85e611cbc7054
Bug: 567348497
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8484511
Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
Commit-Queue: Destin Niyomufasha <ndestin@google.com>
Reviewed-by: Ritika Gupta <ritikagup@google.com>
Cr-Commit-Position: refs/heads/main@{#1710429}