Backport #27265 by @JakobDev
Part of #27065
This PR touches functions used in templates. As templates are not static
typed, errors are harder to find, but I hope I catch it all. I think
some tests from other persons do not hurt.
Co-authored-by: JakobDev <jakobdev@gmx.de>
This PR
- [x] Move some functions from `issues.go` to `issue_stats.go` and
`issue_label.go`
- [x] Remove duplicated issue options `UserIssueStatsOption` to keep
only one `IssuesOptions`
This PR
- [x] Move some code from `issue.go` to `issue_search.go` and
`issue_update.go`
- [x] Use `IssuesOptions` instead of `IssueStatsOptions` becuase they
are too similiar.
- [x] Rename some functions