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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