fix(issues): allow selecting a tag in the issue Branch/Tag dropdown (#39747)

* Fixes #39746
* Fixes #35505

The click handlers were bound only to the first `.reference-list-menu`
(branches), so clicking a tag did nothing. Bind them to the items of
both lists.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/shared/issuelist.tmpl

@@ -88,7 +88,7 @@
 							<span class="gt-ellipsis">{{$project.Title}}</span>
 						</a>
 					{{end}}
-					{{if .Ref}}{{/* TODO: RemoveIssueRef: see "repo/issue/branch_selector_field.tmpl" */}}
+					{{if .Ref}}{{/* TODO: ISSUE-SIDEBAR-REF-SELECTOR: see "repo/issue/branch_selector_field.tmpl" */}}
 						<a class="ref flex-text-inline tw-max-w-[300px]" {{if $.RepoLink}}href="{{index $.IssueRefURLs .ID}}"{{else}}href="{{.Repo.Link}}{{index $.IssueRefURLs .ID}}"{{end}}>
 							{{svg "octicon-git-branch" 14}}
 							<span class="gt-ellipsis">{{index $.IssueRefEndNames .ID}}</span>