Replace CSRF cookie with CrossOriginProtection (#36183)

Removes the CSRF cookie in favor of
[`CrossOriginProtection`](https://pkg.go.dev/net/http#CrossOriginProtection)
which relies purely on HTTP headers.

Fixes: https://github.com/go-gitea/gitea/issues/11188
Fixes: https://github.com/go-gitea/gitea/issues/30333
Helps: https://github.com/go-gitea/gitea/issues/35107

TODOs:

- [x] Fix tests
- [ ] Ideally add tests to validates the protection

---------

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

templates/org/team/new.tmpl

@@ -5,7 +5,6 @@
 		<div class="ui grid">
 			<div class="column">
 				<form class="ui form" action="{{if .PageIsOrgTeamsNew}}{{.OrgLink}}/teams/new{{else}}{{.OrgLink}}/teams/{{.Team.LowerName | PathEscape}}/edit{{end}}" data-delete-url="{{.OrgLink}}/teams/{{.Team.LowerName | PathEscape}}/delete" method="post">
-					{{.CsrfTokenHtml}}
 					<h3 class="ui top attached header">
 						{{if .PageIsOrgTeamsNew}}{{ctx.Locale.Tr "org.create_new_team"}}{{else}}{{ctx.Locale.Tr "org.teams.settings"}}{{end}}
 					</h3>