kata-deploy: pin nydus-snapshotter via versions.yaml

Resolve externals.nydus-snapshotter version and url in the Docker image build
with yq from the repo-root versions.yaml instead of Dockerfile ARG defaults.

Drop the redundant workflow that only enforced parity between those two sources.

Signed-off-by: Fabiano Fidêncio <ffidencio@nvidia.com>

.github/workflows/nydus-snapshotter-version-in-sync.yaml

@@ -1,35 +0,0 @@
-name: nydus-snapshotter-version-sync
-
-on:
-  pull_request:
-    types:
-      - opened
-      - edited
-      - reopened
-      - synchronize
-
-permissions: {}
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  nydus-snapshotter-version-check:
-    name: nydus-snapshotter-version-check
-    runs-on: ubuntu-22.04
-    steps:
-    - name: Checkout code
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      with:
-        persist-credentials: false
-    - name: Ensure nydus-snapshotter-version is in sync inside our repo
-      run: |
-        dockerfile_version=$(grep "ARG NYDUS_SNAPSHOTTER_VERSION" tools/packaging/kata-deploy/Dockerfile | cut -f2 -d'=')
-        versions_version=$(yq ".externals.nydus-snapshotter.version | explode(.)" versions.yaml)
-        if [[ "${dockerfile_version}" != "${versions_version}" ]]; then
-          echo "nydus-snapshotter version must be the same in the following places: "
-          echo "- versions.yaml: ${versions_version}"
-          echo "- tools/packaging/kata-deploy/Dockerfile: ${dockerfile_version}"
-          exit 1
-        fi