Rolling v8/third_party/google_benchmark/src: https://chromium.googlesource.com/external/github.com/google/benchmark/+log/2d054b6..990299f

install docs folder when installing library (#1212) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/990299f

add .DS_Store to .gitignore (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/91ce110

refactor the documentation to minimise `README.md` (#1211) (Dominic Hamon)
https://chromium.googlesource.com/external/github.com/google/benchmark/+/201b981

TBR=v8-waterfall-sheriff@grotations.appspotmail.com,mtv-sf-v8-sheriff@grotations.appspotmail.com,mlippautz@chromium.org

Change-Id: Idf8867d550ac0eccb330b6275fd9911f4cc859a6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3102598Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#76357}