feat: Add Actions API rerun endpoints for runs and jobs (#36768)

This PR adds official REST API endpoints to rerun Gitea Actions workflow
runs and individual jobs:

* POST /api/v1/repos/{owner}/{repo}/actions/runs/{run}/rerun
* POST /api/v1/repos/{owner}/{repo}/actions/runs/{run}/jobs/{job_id}/rerun

It reuses the existing rerun behavior from the web UI and exposes it
through stable API routes.

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

models/repo/repo_unit.go

@@ -241,6 +241,8 @@ type ProjectsConfig struct {
 
 // FromDB fills up a ProjectsConfig from serialized format.
 func (cfg *ProjectsConfig) FromDB(bs []byte) error {
+	// TODO: remove GetProjectsMode, only use ProjectsMode
+	cfg.ProjectsMode = ProjectsModeAll
 	return json.UnmarshalHandleDoubleEncode(bs, &cfg)
 }