Document usage of managed identities and credentials

[kachawla]

As a part of https://github.com/radius-project/radius/issues/7309, some workflows have been switched over to use managed identities. Creating this issue to ensure corresponding documentation is updated to reflect the current state and remove any outdated information.

AB#11561

[radius-triage-bot[bot]]

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[radius-triage-bot[bot]]

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We also welcome community contributions! If you would like to pick this item up sooner and submit a pull request, please visit our contribution guidelines and assign this to yourself by commenting "/assign" on this issue.

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[radius-triage-bot[bot]]

We've prioritized work on this issue. Please subscribe to this issue for notifications, we'll provide updates as we make progress.

We also welcome community contributions! If you would like to pick this item up sooner and submit a pull request, please visit our contribution guidelines and assign this to yourself by commenting "/assign" on this issue.

For more information on our triage process please visit our triage overview