### Description of the change
With https://github.com/go-gitea/gitea/pull/28390, Gitea 1.21.2 introduced warning log output within the result of `gitea admin <subcommand>` and therefore affects the current provisioning script.
That script previously assumed a clean result set and was therefore doomed to fail at _some_ point.
This introduces output sanitizing to trim such logs above the actual result table.
### Applicable issues
- fixes#589
### Additional information
The non-sanitized output were only an issue for admin account provisioning, and only when the username matched one of these words (in case of #589 it was `gitea`):
```text
.../setting/security.go:168:loadSecurityFrom() [W] Enabling Query API Auth tokens is not recommended. DISABLE_QUERY_AUTH_TOKEN will default to true in gitea 1.23 and will be removed in gitea 1.24.
```
LDAP and OAuth sources were not affected by this particular log line, but also processed non-sanitized result sets. Changing their code is a precaution.
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/590
Reviewed-by: pat-s <pat-s@noreply.gitea.com>
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-committed-by: justusbunsi <sk.bunsenbrenner@gmail.com>
justusbunsi
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