Fix incorrect release count (#25879) (#25887)

Backport #25879 by @yp05327

Release count is not correct:
https://try.gitea.io/yp05327/testrepo/tags

![image](https://github.com/go-gitea/gitea/assets/18380374/07f97c62-d450-4ccb-b3f2-3e0af9d9fc52)

https://try.gitea.io/yp05327/testrepo/releases

![image](https://github.com/go-gitea/gitea/assets/18380374/6f1d55a4-bb68-445d-84b9-90552a40f403)

https://try.gitea.io/yp05327/testrepo/releases/tag/testtag

![image](https://github.com/go-gitea/gitea/assets/18380374/09ab5d51-52b6-4621-a571-3100198eb260)

We already have correct release count, no need to calculate it again.

c5e187c389/modules/context/repo.go (L547)

Co-authored-by: yp05327 <576951401@qq.com>

routers/web/repo/release.go

@@ -196,7 +196,6 @@ func releasesOrTags(ctx *context.Context, isTagList bool) {
 	}
 
 	ctx.Data["Releases"] = releases
-	ctx.Data["ReleasesNum"] = len(releases)
 
 	pager := context.NewPagination(int(count), opts.PageSize, opts.Page, 5)
 	pager.SetDefaultParams(ctx)

templates/repo/release_tag_header.tmpl

@@ -5,7 +5,7 @@
 	<div class="gt-df">
 		<div class="gt-f1 gt-df gt-ac">
 			<h2 class="ui compact small menu header small-menu-items">
-				<a class="{{if .PageIsReleaseList}}active {{end}}item" href="{{.RepoLink}}/releases">{{.locale.PrettyNumber .ReleasesNum}} {{.locale.TrN .ReleasesNum "repo.release" "repo.releases"}}</a>
+				<a class="{{if .PageIsReleaseList}}active {{end}}item" href="{{.RepoLink}}/releases">{{.locale.PrettyNumber .NumReleases}} {{.locale.TrN .NumReleases "repo.release" "repo.releases"}}</a>
 				{{if $canReadCode}}
 					<a class="{{if .PageIsTagList}}active {{end}}item" href="{{.RepoLink}}/tags">{{.locale.PrettyNumber .NumTags}} {{.locale.TrN .NumTags "repo.tag" "repo.tags"}}</a>
 				{{end}}