gitea github-runner test

[ChristopherHX]

This verifies github_runner scaler compatbility with https://github.com/go-gitea/gitea (review pending for v1.25.0)

Cloned the github_runner e2e test to run against a local Gitea instance of go-gitea/gitea#33964

• Removed the cancel run
  • this e2e deploys a Gitea Server for testing into another namespace by default
• Replaced the workflow id by file names, Gitea currently do not support numeric ids of these endpoints
• Verifies GitHub Api Compatibility of Gitea
• github_runner can be tested without github.com
• added vendor/k8s.io/client-go/tools/portforward to allow the test controller to make Gitea Api calls
  • within kubernetes this is not used

Checklist

• Tests have been added
• A PR is opened to update the documentation on (repo) (if applicable)
  • Once Gitea side is merged and this test still passes
• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• Use official Gitea images for test
  • Once Add workflow_run api + webhook go-gitea/gitea#33964 merged and we have an act_runner that accepts a PAT token via env

Further enhancements

• add a gitea_runner scaler
• allow gitea-global and gitea-user scope in github_runner
• implement paging when rate limiting is not enforced like on Gitea
• make Gitea Api calls within kubernetes instead of port forwarding

Relates to #6488, go-gitea/gitea#33964