grpc: Replace deprecated otelgrpc interceptors
This should stay in draft mode until this upstream bug is fixed.
Fixes https://github.com/letsencrypt/boulder/issues/7235
I think filtering healthchecks isn't actually that important, so it would be fine to merge this and have a tracking bug to filter them later. We can always drop them in the collector, if we need.
There's an open PR to add filtering, I'm inclined to let that play out and wait for a new otelgrpc version to be released.
The upstream PR has been merged, but we need to wait for a new otelhttp release to be cut. The existing version bump https://github.com/letsencrypt/boulder/pull/7467 has problems, so :|.
#7467 has been merged, is this now ready to move forward again?
Answer: No, the release we updated to doesn't contain the relevant PR. We still need to wait for the next release.
Replaced by https://github.com/letsencrypt/boulder/pull/7496