docs: add permissions roles table and enterprise OIDC mapping guidance

[balaakasam]

Description

Adds a complete permissions roles table to the OIDC configuration documentation, explaining what each Dependency-Track permission grants to authenticated users. Also adds a recommended enterprise role structure and guidance on mapping OIDC groups in Microsoft Entra ID, Keycloak, and Okta.

Addressed Issue

closes #5841

Additional Details

The existing documentation explained how to configure OIDC but did not describe what permissions are available in Dependency-Track or how to structure teams for enterprise deployments. This left administrators without guidance on which permissions to assign when mapping identity provider groups to Dependency-Track teams.

This change is documentation only - no code changes.

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[owasp-dt-bot]

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[codacy-production]

Up to standards ✅

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[balaakasam]

Hi, just following up on this PR. Happy to make any adjustments if needed, please let me know. Thanks for your time!

[balaakasam]

Hi approver/maintainer team, just checking on this PR if any changes are needed from me. Please let me know. Thank you!

[balaakasam]

Hi @nscuro, thank you for the detailed review and feedback. I went ahead and addressed all the feedback:

1. Replaced the permissions table with a link to the existing Users and Permissions page
2. Changed "Recommended" to "Example" role structure with updated wording to clarify
3. Added VIEW_PORTFOLIO to all roles in the example table
4. Removed the duplicate Keycloak and Entra ID sections
5. Expanded the existing UUID note in the Entra ID section with actionable guidance

Please let me know if any further changes are needed, I will be happy to make any changes.