Users: Fix org user always getting org id = 1 on auto assign false

[Jguer]

What is this feature?

Fix org user always getting org id = 1 on auto assign false.

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 #63562

Special notes for your reviewer:

[grafanabot]

Hello @Jguer!
Backport pull requests need to be either:

• Pull requests which address bugs,
• Urgent fixes which need product approval, in order to get merged,
• Docs changes.

Please, if the current pull request addresses a bug fix, label it with the type/bug label.
If it already has the product approval, please add the product-approved label. For docs changes, please add the type/docs label.
If none of the above applies, please consider removing the backport label and target the next major/minor release.
Thanks!

[eleijonmarck]

LGTM, did not test locally, just pulled and check through code

[vtorosyan]

#63562 related issue

[grafanabot]

The backport to v9.4.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-63708-to-v9.4.x origin/v9.4.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x c8db771939f783d1533421876ccf17648d77019e
# Push it to GitHub
git push --set-upstream origin backport-63708-to-v9.4.x
git switch main
# Remove the local backport branch
git branch -D backport-63708-to-v9.4.x

Then, create a pull request where the base branch is v9.4.x and the compare/head branch is backport-63708-to-v9.4.x.