Remove CA pipeline from VPA release branch

.ci/pipeline_definitions

@@ -1,74 +1,3 @@
-autoscaler:
-  base_definition:
-    repo:
-      source_labels:
-      - name: 'cloud.gardener.cnudie/dso/scanning-hints/source_analysis/v1'
-        value:
-          policy: 'scan'
-          path_config:
-            exclude_paths:
-              - '.*/aws-sdk-go/.*'
-              - '^vendor/.*'
-              - '.*/vendor/.*'
-              - '.*/cloudprovider/((?!mcm/).)*/.*'
-              - '^addon-resizer/.*'
-              - '^vertical-pod-autoscaler/.*'
-    traits:
-      version:
-        preprocess:
-          'inject-commit-hash'
-        inject_effective_version: true
-      component_descriptor:
-        ocm_repository: europe-docker.pkg.dev/gardener-project/snapshots
-      publish:
-        oci-builder: docker-buildx
-        platforms:
-        - linux/amd64
-        - linux/arm64
-        dockerimages:
-          cluster-autoscaler:
-            inputs:
-              repos:
-                source: ~ # default
-              steps:
-                build: ~
-            image: europe-docker.pkg.dev/gardener-project/snapshots/gardener/autoscaler/cluster-autoscaler
-            dockerfile: './cluster-autoscaler/Dockerfile'
-    steps:
-      test:
-        image: 'golang:1.20.5'
-      build:
-        image: 'golang:1.20.5'
-        output_dir: 'binary'
-  jobs:
-    head-update:
-      traits:
-        component_descriptor:
-          ocm_repository_mappings:
-            - repository: europe-docker.pkg.dev/gardener-project/releases
-        draft_release: ~
-    pull-request:
-      traits:
-        pull-request: ~
-    release:
-      traits:
-        version:
-          preprocess: 'finalize'
-        component_descriptor:
-          ocm_repository: europe-docker.pkg.dev/gardener-project/releases
-        publish:
-          dockerimages:
-            cluster-autoscaler:
-              image: europe-docker.pkg.dev/gardener-project/releases/gardener/autoscaler/cluster-autoscaler
-        release:
-          nextversion: 'bump_minor'
-        slack:
-          default_channel: 'internal_scp_workspace'
-          channel_cfgs:
-            internal_scp_workspace:
-              channel_name: 'C0170QTBJUW' # gardener-mcm
-              slack_cfg_name: 'scp_workspace'
-
 vertical-pod-autoscaler:
   base_definition:
     repo: