Support .git-blame-ignore-revs file (#26395)

Closes #26329

This PR adds the ability to ignore revisions specified in the
`.git-blame-ignore-revs` file in the root of the repository.


![grafik](https://github.com/go-gitea/gitea/assets/1666336/9e91be0c-6e9c-431c-bbe9-5f80154251c8)

The banner is displayed in this case. I intentionally did not add a UI
way to bypass the ignore file (same behaviour as Github) but you can add
`?bypass-blame-ignore=true` to the url manually.

---------

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

templates/repo/blame.tmpl

@@ -1,3 +1,15 @@
+{{if or .UsesIgnoreRevs .FaultyIgnoreRevsFile}}
+	{{$revsFileLink := URLJoin .RepoLink "src" .BranchNameSubURL "/.git-blame-ignore-revs"}}
+	{{if .UsesIgnoreRevs}}
+		<div class="ui info message">
+			<p>{{.locale.Tr "repo.blame.ignore_revs" $revsFileLink (print $revsFileLink "?bypass-blame-ignore=true") | Str2html}}</p>
+		</div>
+	{{else}}
+		<div class="ui error message">
+			<p>{{.locale.Tr "repo.blame.ignore_revs.failed" $revsFileLink | Str2html}}</p>
+		</div>
+	{{end}}
+{{end}}
 <div class="{{TabSizeClass .Editorconfig .FileName}} non-diff-file-content">
 	<h4 class="file-header ui top attached header gt-df gt-ac gt-sb gt-fw">
 		<div class="file-header-left gt-df gt-ac gt-py-3 gt-pr-4">