Newly pushed branches hints on repository home page (#25715)

This PR will display a pull request creation hint on the repository home
page when there are newly created branches with no pull request. Only
the recent 6 hours and 2 updated branches will be displayed.

Inspired by #14003 
Replace #14003 
Resolves #311
Resolves #13196
Resolves #23743

co-authored by @kolaente

templates/repo/home.tmpl

@@ -3,6 +3,7 @@
 	{{template "repo/header" .}}
 	<div class="ui container {{if .IsBlame}}fluid padded{{end}}">
 		{{template "base/alert" .}}
+		{{template "repo/code/recently_pushed_new_branches" .}}
 		{{if and (not .HideRepoInfo) (not .IsBlame)}}
 		<div class="ui repo-description">
 			<div id="repo-desc">