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/repo/release/new.tmpl

@@ -19,7 +19,6 @@
 			data-tag-helper-new="{{ctx.Locale.Tr "repo.release.tag_helper_new"}}"
 			data-tag-helper-existing="{{ctx.Locale.Tr "repo.release.tag_helper_existing"}}"
 		>
-			{{.CsrfTokenHtml}}
 			<div class="inline field {{if .Err_TagName}}error{{end}}">
 				<label class="tw-block tw-mb-1"><b>{{ctx.Locale.Tr "repo.git_tag"}}</b></label>
 				{{if .PageIsEditRelease}}