smuthukaruppannp

@AWSHurneyt this PR adds the ability to assign backend roles in the UI as per our discussion. Please review and provide your feedback

@AWSHurneyt, a gentle reminder to review this PR when you get a chance. Thanks.

> @smuthukaruppannp I was actually just discussing this PR with the team last week. > > I showed your changes to one of our UI developers to confirm that the...

> @plin13 Thank you for the contribution! > > We're actually actively working on enhancing the alerting plugin to support cross-cluster monitors, and are aiming for a 2.12 or 2.13...

> For visibility, we discussed over a call last week that we'd like to get these changes in for the 2.12 release. The internal team is working on more extensive...

@AWSHurneyt i have added additional unit and integration test cases as suggested. Please review and let me know (looks like some internal changes have been committed to main)

I have submitted a [PR](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/799) to address [570](https://github.com/opensearch-project/alerting-dashboards-plugin/issues/570). I believe it addresses some of the items in this enhancement. I will appreciate your review and feedback on PR [#799](https://github.com/opensearch-project/alerting-dashboards-plugin/pull/799)

I would like to submit a PR for this issue. I have made the following high level changes and verified that i am able to create monitors with remote indices...