2021-September-12 - Prerelease - 2.6.372

Remove errorprone static analysis (#9604)

Removing for a number of reasons:
- relatively significant false positive rate
- redundancy with other static checkers means we do  not get a lot of unique benefit.
- error prone is somewhat brittle by wrapping javac
- stuck on an older version
- does not play well with lombok
- failures during javac due to error prone does  not play well with other tooling that well.
  Notably we want each static check to fail independently  and not have a case where 
  everything fails because of an error prone violation.

Further discussion in: #9599