chore(ci): use unified Gitlab pipeline for APM libraries [backport 2.9]

.github/workflows/build_deploy.yml

@@ -2,12 +2,6 @@ name: Build
 
 on:
   push:
-    branches:
-      - '[0-9].[0-9]*'
-      - '[0-9].x'
-      # special branches used to test this workflow
-      # before merging/releasing
-      - build_deploy*
   pull_request:
   release:
     types:
@@ -128,12 +122,3 @@ jobs:
           # due to a duplicate wheel being present which will ensure that the rest
           # of the wheels will be uploaded if some are uploaded manually.
           skip_existing: true
-
-  build-and-publish-init-image:
-    needs: [upload_pypi]
-    uses: ./.github/workflows/lib-inject-publish.yml
-    secrets:
-      token: ${{ secrets.GITHUB_TOKEN }}
-    with:
-      ddtrace-version: ${{ github.ref_name }}
-      image-tag: ${{ github.ref_name }}