ui/oidc: Add 'groups' scope when requesting an id_token from Dex

[gdemonet]

Component: ui

Context:

In the scopes we request from Dex when retrieving and id_token to then
authenticate to K8s API, we didn't include the 'groups' optional scope.
This meant that apiserver couldn't retrieve the 'groups' claim from the
generated token, hence the authenticated user wouldn't be able to assume
roles based on Group-based (Cluster)RoleBindings.

Summary:

We add this scope to the redux-oidc manager configuration, and this
resolves the issue.

Acceptance criteria:

See #2526 reproducing steps - group-based RBAC should be functional

---

Closes: #2526

[bert-e]

Hello gdemonet,

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[bert-e]

Branches have diverged

This pull request's source branch bugfix/2526-add-groups-scope has diverged from
development/2.6 by more than 50 commits.

To avoid any integration risks, please re-synchronize them using one of the
following solutions:

• Merge origin/development/2.6 into bugfix/2526-add-groups-scope
• Rebase bugfix/2526-add-groups-scope onto origin/development/2.6

Note: If you choose to rebase, you may have to ask me to rebuild
integration branches using the reset command.

[ChengYanJin]

LGTM!

The base branch was changed.

[bert-e]

Integration data created

I have created the integration data for the additional destination branches.

• this pull request will merge bugfix/2526-add-groups-scope into
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• w/2.6/bugfix/2526-add-groups-scope will be merged into development/2.6

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[bert-e]

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[gdemonet]

/approve

[bert-e]

In the queue

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[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/2.5

• ✔️ development/2.6

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Please check the status of the associated issue None.

Goodbye gdemonet.