Switch docker upgrade script to submit issue rather than PR

Closes gh-20976

ci/tasks/create-pull-request.yml

@@ -1,14 +0,0 @@
----
-platform: linux
-inputs:
-  - name: git-repo
-  - name: commit-details
-params:
-  BASE_BRANCH:
-  BRANCH:
-  GITHUB_REPO:
-  GITHUB_ORGANIZATION:
-  GITHUB_PASSWORD:
-  GITHUB_USERNAME:
-run:
-  path: git-repo/ci/scripts/create-pull-request.sh

ci/tasks/detect-docker-updates.yml

@@ -2,13 +2,11 @@
 platform: linux
 inputs:
   - name: git-repo
-  - name: git-repo-ci-docker
-outputs:
-  - name: git-repo-updated
-  - name: commit-details
 params:
   GITHUB_REPO:
   GITHUB_ORGANIZATION:
+  GITHUB_PASSWORD:
+  GITHUB_USERNAME:
   MILESTONE:
 run:
   path: git-repo/ci/scripts/detect-docker-updates.sh