Move jobparser from act repository to Gitea (#36699)

The jobparser sub package in act is only used by Gitea. Move it to Gitea
to make it more easier to maintain.

---------

Co-authored-by: Christopher Homberger <christopher.homberger@web.de>

modules/actions/jobparser/testdata/prefixed_newline.in.yaml

@@ -0,0 +1,14 @@
+name: Step with leading new line
+
+on:
+  push:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "\nExtract tag for variant"
+        id: extract_tag
+        run: |
+
+          echo Test