yp05327 8abc1aae4a Improve the list header in milestone page (#27302) ...

The ui of list header in milestone page is not same as issue and pr list
page.
And they are using different template codes which can be merged into
one.

Before:

![image](https://github.com/go-gitea/gitea/assets/18380374/29eb426c-2dd6-4cf2-96e0-82339fb631bb)

![image](https://github.com/go-gitea/gitea/assets/18380374/b36c4dff-469a-4395-8a02-a8c54e17ab21)



![image](https://github.com/go-gitea/gitea/assets/18380374/d882c74a-451b-431d-b58e-3635a15d9718)

![image](https://github.com/go-gitea/gitea/assets/18380374/292cd38d-1b50-47f1-b32c-9b5de90ce5fb)


After:

![image](https://github.com/go-gitea/gitea/assets/18380374/4529234e-67dc-4e17-9440-e638be4fbc41)

![image](https://github.com/go-gitea/gitea/assets/18380374/c15b4d86-0762-497b-b28d-72d09443d629)

---------

Co-authored-by: puni9869 <80308335+puni9869@users.noreply.github.com>

2023-10-18 00:03:42 +00:00

..

filter_list.tmpl

…

select_menu.tmpl

…