Add tag protection (#15629)

* Added tag protection in hook.

* Prevent UI tag creation if protected.

* Added settings page.

* Added tests.

* Added suggestions.

* Moved tests.

* Use individual errors.

* Removed unneeded methods.

* Switched delete selector.

* Changed method names.

* No reason to be unique.

* Allow editing of protected tags.

* Removed unique key from migration.

* Added docs page.

* Changed date.

* Respond with 404 to not found tags.

* Replaced glob with regex pattern.

* Added support for glob and regex pattern.

* Updated documentation.

* Changed white* to allow*.

* Fixed edit button link.

* Added cancel button.

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/repo/settings/navbar.tmpl

@@ -11,6 +11,9 @@
 				{{.i18n.Tr "repo.settings.branches"}}
 			</a>
 		{{end}}
+		<a class="{{if .PageIsSettingsTags}}active{{end}} item" href="{{.RepoLink}}/settings/tags">
+			{{.i18n.Tr "repo.settings.tags"}}
+		</a>
 		{{if not DisableWebhooks}}
 			<a class="{{if .PageIsSettingsHooks}}active{{end}} item" href="{{.RepoLink}}/settings/hooks">
 				{{.i18n.Tr "repo.settings.hooks"}}