Summary:
This diff fixes 3 issues -
1. Empty line getting generated in the gFlag config for the servers.
2. Upload of JWKS keys for OIDC configuration.
3. Symlinking of folders - for software upgrade we upgrade first master and then tserver.

Test Plan:
Manually verified.
iTest pipeline.

Reviewers: nsingh, vbansal

Reviewed By: nsingh, vbansal

Subscribers: anijhawan

Differential Revision: https://phorge.dev.yugabyte.com/D45205