Fix MongoDB 8.x auth problem

[haoxianhan]

Summary

Fix mc_worker_api:connect/1 for MongoDB 8.1+ when pre-auth buildInfo is rejected.

mc_worker_api:connect/1 used buildInfo before auth to detect the server version.
On MongoDB 8.1+, that can fail with Unauthorized, so SCRAM auth never starts.

This change removes that auth-time buildInfo check and uses the handshake response to choose the auth mode instead.
Also adds a regression test and runs it in CI against MongoDB 8.2.5.

Testing

• rebar3 ct --suite=test/buildinfo_auth_SUITE.erl

[turingmachinerepair]

Just want to add that it affects MongoDB 8.1 and newer https://www.mongodb.com/docs/manual/release-notes/8.2-compatibility/#driver-incompatibility
And signal that I am also interested in this fix.

[haoxianhan]

The branch has been updated since the initial PR version. Instead of only handling the pre-auth buildInfo Unauthorized case, the current change removes the auth-time buildInfo dependency entirely and uses the handshake response
(hello/isMaster + maxWireVersion) to choose the auth path.

There is no official mongo:8.1 tag on Docker Hub right now, so the regression test uses mongo:8.2.5, which matches the MongoDB version currently used in production in my case.

[comtihon]

Thank you!