[feature](fe) Support OIDC session credentials for Iceberg REST catalog

[CalvinKirs]

Issue Number: None

Related PR: None

Problem Summary: Allow Iceberg REST catalog to use the authenticated user credential when iceberg.rest.session=user is configured, and avoid sharing Iceberg table/schema/snapshot cache for per-user REST session loads.

Support Iceberg REST catalog user session authentication with OAuth/OIDC delegated credentials.

• Test: FE UT
  • ./run-fe-ut.sh --run org.apache.doris.datasource.iceberg.IcebergSessionCatalogAdapterTest
  • ./run-fe-ut.sh --run org.apache.doris.datasource.property.metastore.IcebergRestPropertiesTest
  • ./run-fe-ut.sh --run org.apache.doris.mysql.authenticate.AuthenticatorManagerTest
• Behavior changed: Yes, Iceberg REST catalog can use authenticated user delegated credentials when iceberg.rest.session=user is enabled.
• Does this need documentation: No

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

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