Enables frozen string for the following files: * lib/generators/**/*.rb * lib/gitaly/**/*.rb * lib/google_api/**/*.rb * lib/haml_lint/**/*.rb * lib/json_web_token/**/*.rb * lib/mattermost/**/*.rb * lib/microsoft_teams/**/*.rb * lib/object_storage/**/*.rb * lib/omni_auth/**/*.rb * lib/peek/**/*.rb * lib/rouge/**/*.rb * lib/rspec_flaky/**/*.rb * lib/system_check/**/*.rb Partially addresses #47424.
* Replace `require` or `require_relative` with `require_dependency` * Remove unneeded `autoload`
Signed-off-by: Rémy Coutable <remy@rymai.me>