Actions Runner rest api (#33873)

Implements runner apis based on
https://docs.github.com/en/rest/actions/self-hosted-runners?apiVersion=2022-11-28#list-self-hosted-runners-for-an-organization

- Add Post endpoints for registration-token, google/go-github revealed
this as problem
  - We should deprecate Get Endpoints, leaving them for compatibility
- Get endpoint of admin has api path /admin/runners/registration-token
that feels wrong, /admin/actions/runners/registration-token seems more
consistent with user/org/repo api
- Get Runner Api
- List Runner Api
- Delete Runner Api

- Tests admin / user / org / repo level endpoints

Related to #33750 (implements point 1 and 2)
Via needs discovered in #32461, this runner api is needed to allow
cleanup of runners that are deallocated without user interaction.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/swagger/repo.go

@@ -457,6 +457,20 @@ type swaggerRepoArtifact struct {
 	Body api.ActionArtifact `json:"body"`
 }
 
+// RunnerList
+// swagger:response RunnerList
+type swaggerRunnerList struct {
+	// in:body
+	Body api.ActionRunnersResponse `json:"body"`
+}
+
+// Runner
+// swagger:response Runner
+type swaggerRunner struct {
+	// in:body
+	Body api.ActionRunner `json:"body"`
+}
+
 // swagger:response Compare
 type swaggerCompare struct {
 	// in:body