Clean up gRPC debug_error_string messages in Sentry

Stan Hurequested to merge
sh-sanitized-grpc-debug-strings into master

The upgrade of gRPC brought along a debug_error_string that makes it harder for Sentry to group similar exceptions together. There doesn't appear to be a way to turn this off, so we clean this up in a Sentry field processsor. Now exceptions will have a field grpc_debug_error_string field in the extra section.

This was originally introduced in !40938 (merged) but reverted in !41083 (merged). But it's needed because not all Gitaly calls are wrapped via WrapsGitalyErrors.

Relates to #238465

Edited by Stan Hu

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