[v9.5.x] LDAP: FIX Enable users on successfull login

[gamab]

Backport c8149d5 from #75073

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What is this feature?

In previous versions, before the new auth broker service was introduced, we used to enable users upon successful ldap login.
We had a regression when switching to the auth broker service.
This PR intends to fix this issue.

Why do we need this feature?

[Add a description of the problem the feature is trying to solve.]

Who is this feature for?

[Add information on what kind of user the feature is for.]

Which issue(s) does this PR fix?:

Fixes #

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.