Extend the Project Config API in Sentry

[Dav1dde]

Follow up for #3887.

Project config API was extended to include the revision in the request, Relay has been updated but Sentry's API still ignores the additional revision information.

COS:

1. check whether it makes sense to include the revisions checks in Sentry (does it even make sense to skip triggering a re-compute, is it feasible to check this)
2. If the answer to 1) is yes, implement it :)