Update credential watcher to allow second credential watcher

[aphralG]

Proposed changes

Updated credential watcher to allow a second credential watcher to be started to monitor auxiliary command sever.

• Credential watcher now takes a sever type to be used to determine if it is aux or command sever
• Removed sending of CredentialUpdatedTopic from watcher plugin
• Moved creation of new GRPC connection from watcher plugin into credential watcher when update is detected
• CredentialUpdateMessage now has Server Type and GRPC connection

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13