Allows users to pass thier own secrets to Grafana admin

[vara-bonthu]

What does this PR do?

• Allows users to pass their secret to grafana adminPassword field through set_sensitive values
• Example added to create a new secret with Secrets Manager and pass that to Helm Chart

Motivation

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[Zvikan]

Thanks Vara, while I'm reviewing this can you please address the failed check

[Zvikan]

LGTM, thank you for the fix, let's make sure all checks are green and happy.
Will also want to run the E2E on this example once merged, as this should work now with multiple applies since you used implicit dependencies for the secret manager.

[bryantbiggs]

Looks great, thanks for this change!