Feat: Added secret manager for JDBC url

[uriarriaga]

No description provided.

[surjits254]

Discussed with @uriarriaga to create PR from dataproc-templates branch instead of forked branch. As integration test runs are not supported from forked branch.
cc: @sundar-mudupalli-work

[sundar-mudupalli-work]

Uriel,

Thank you so much for your contribution. Can you take a look how the jdbc-to-jdbc templates handle secrets ?

The documentation is here

The specific code fragment where the secret is fetched is here

In general, I would like the parameter and behavior to be consistent across the different templates, so that they are easier to use. If you think we should use the behavior per your code, can you explain ?

Thanks again.

Sundar Mudupalli