OAuth 2: JWT token refresh should preserve user identity displayed in the UI (backport #12818)

[mergify]

Proposed Changes

Closes #12598

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

---

This is an automatic backport of pull request #12818 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3718fe3 has failed:

On branch mergify/bp/v4.0.x/pr-12818
Your branch is up to date with 'origin/v4.0.x'.

You are currently cherry-picking commit 3718fe3289.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   deps/rabbitmq_auth_backend_oauth2/test/jwks_SUITE.erl
	modified:   deps/rabbitmq_auth_backend_oauth2/test/system_SUITE.erl

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbitmq_auth_backend_oauth2/src/rabbit_auth_backend_oauth2.erl

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[michaelklishin]

can you please resolve these conflicts? You have much more context on the main vs. v4.0.x differences in this plugin.

[michaelklishin]

@MarcialRosales thank you!