[GH Rate Limit] - Add Functions to Detect Rate Limit Redis keys

[adrian-codecov]

We want to add common functions to be shared bw platform and applications team to detect if a token is rate limited. Follow this block + article if needed https://www.notion.so/sentry/Surface-GH-Rate-Limit-Errors-563c8ee1a4e04fd88c257ca804eb281f?pvs=4#5a1e27c4adbc45e9af4a2ee5c5d6993a