Trace request ids across RPC calls

[blkt]

We want both end users and our smoke tests to be able to report which requests failed, and then track down logs using a shared request id.

Some work was already done in this regard

• polish/wrap up https://github.com/stacklok/minder/pull/4461
• ensure that the header gets through all our proxies without being dropped (a simple smoke tests would be valuable)