Add workflow_run api + webhook (#33964)

Implements 
- https://docs.github.com/en/rest/actions/workflow-jobs?apiVersion=2022-11-28#list-jobs-for-a-workflow-run--code-samples
- https://docs.github.com/en/rest/actions/workflow-jobs?apiVersion=2022-11-28#get-a-job-for-a-workflow-run--code-samples
- https://docs.github.com/en/rest/actions/workflow-runs?apiVersion=2022-11-28#list-workflow-runs-for-a-repository
- https://docs.github.com/en/rest/actions/workflow-runs?apiVersion=2022-11-28#get-a-workflow-run
  - `/actions/runs` for global + user + org (Gitea only)
  - `/actions/jobs` for global + user + org + repository (Gitea only)
  - workflow_run webhook + action trigger
    - limitations
- workflow id is assigned to a string, this may result into problems in
strongly typed clients

Fixes
- workflow_job webhook url to no longer contain the `runs/<run>` part to
align with api
- workflow instance does now use it's name inside the file instead of
filename if set

Refactoring
- Moved a lot of logic from workflows/workflow_job into a shared module
used by both webhook and api

TODO
- [x] Verify Keda Compatibility
- [x] Edit Webhook API bug is resolved
 
Closes https://github.com/go-gitea/gitea/issues/23670
Closes https://github.com/go-gitea/gitea/issues/23796
Closes https://github.com/go-gitea/gitea/issues/24898
Replaces https://github.com/go-gitea/gitea/pull/28047 and is much more
complete

---------

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

services/context/base_form.go

@@ -12,6 +12,8 @@ import (
 )
 
 // FormString returns the first value matching the provided key in the form as a string
+// It works the same as http.Request.FormValue:
+// try urlencoded request body first, then query string, then multipart form body
 func (b *Base) FormString(key string, def ...string) string {
 	s := b.Req.FormValue(key)
 	if s == "" {
@@ -20,7 +22,7 @@ func (b *Base) FormString(key string, def ...string) string {
 	return s
 }
 
-// FormStrings returns a string slice for the provided key from the form
+// FormStrings returns a values for the key in the form (including query parameters), similar to FormString
 func (b *Base) FormStrings(key string) []string {
 	if b.Req.Form == nil {
 		if err := b.Req.ParseMultipartForm(32 << 20); err != nil {