Show if File is Executable (#25287) (#25300)

Backport #25287 by @JakobDev

This simply shows if a File has the executable Permission


![grafik](https://github.com/go-gitea/gitea/assets/15185051/1d50c105-6d55-4ecc-808a-c9cd5559d238)

Co-authored-by: JakobDev <jakobdev@gmx.de>
Co-authored-by: silverwind <me@silverwind.io>

routers/web/repo/view.go

@@ -382,6 +382,7 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	ctx.Data["IsRepresentableAsText"] = isRepresentableAsText
 	ctx.Data["IsDisplayingSource"] = isDisplayingSource
 	ctx.Data["IsDisplayingRendered"] = isDisplayingRendered
+	ctx.Data["IsExecutable"] = entry.IsExecutable()
 
 	isTextSource := fInfo.isTextFile || isDisplayingSource
 	ctx.Data["IsTextSource"] = isTextSource