Rephrase lack of OIDC group support

[JakeSCahill]

Description

Review deadline: March 14

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Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

[hyperlint-ai-deprecated]

PR Change Summary

Updated the Redpanda Console documentation to clarify the removal of OIDC group support and the introduction of RBAC for authorization management.

• Clarified that OIDC group-based authorization is no longer supported in Redpanda Console.
• Updated documentation to reflect that RBAC is now used for access management.
• Renamed configuration fields for better clarity regarding authentication.

Modified Files

• modules/upgrade/partials/console/v3-breaking-changes.adoc

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[deniscoady]

LGTM!

[Feediver1]

lgtm