Add workflow_run api + webhook

[ChristopherHX]

EXPERIMENTAL due to lack of automated tests, this can take some weeks to catch up

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
• workflow_run webhook + action trigger
  • limitations
    • max workflow chaining depth 2 instead of 5 (webhook is always delivered, just no workflow is triggered)
    • workflows filter only accepts workflow file names e.g. ci.yml not something like CI
    • branches-ignore not implemented yet
    • such filters not even manually tested yet
    • workflow id is assigned to a string, this may result into problems in strongly typed clients
  • This webhook should implement everything like previous workflow_job webhook PR

Fixes

• workflow_job webhook url to no longer contain the runs/<run> part to align with api

Refactoring

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

Closes #23670
Closes #23796
Closes #24898
Replaces #28047 and is much more complete