Update base for Update on "[Better Engineering] Bump ruff to 0.0.278 and fix new lint errors"
Bump ruff to 0.0.278 and fix new lint errors. I added noqa to all existing RUF012 errors which requires mutable class variables to be annotated with `ClassVar`, as well as all PERF issues.
Signed-off-by: Justin Chu <justinchumicrosoft.com>
[ghstack-poisoned]