Summary: Add the V2 APIs to invoke node agent upgrade which can also perform custom cert replacement. The implementation will follow. Sending this out to make the diff smaller.

Test Plan: Build passed.

Reviewers: amindrov, skhilar, nbhatia, #yba-api-review

Reviewed By: amindrov, #yba-api-review

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D57086