Add label 'is_active' to 'gitea_users' metric.

[tobiasbp]

Feature Description

Currently, the metric gitea_users returns the number of user accounts in Gitea regardless of their active status.

I would like to add the label is_active to the metric, so gitea_users would be reported like this:

...
# HELP gitea_users Number of Users
# TYPE gitea_users gauge
gitea_users{is_active="true"} 20
gitea_users{is_active="false"} 10
...

The metrics above would be from a Gitea instance with 30 user accounts. 20 of the accounts are active and 10 of the accounts are not active.

Screenshots

No response

[tobiasbp]

I have added a PR here: #34326