fix(ci): Disable arm64 install in release workflow (#12599)

Our release workflow exercises an install on a manually managed ARM host. This
is fragile, and has fallen into disrepair. Practically speaking, we have never
found an issue in the ARM test -- if it builds, it works.

This commit removes the arm install from the release workflow.

.github/workflows/release.yml

@@ -146,49 +146,6 @@ jobs:
           [[ "$TAG" == "$($CMD version --short --client)" ]]
           bin/tests --images preload --name ${{ matrix.integration_test }} "$CMD"
 
-  arm64_integration_tests:
-    needs: [tag, docker_build]
-    runs-on: [self-hosted, Linux, ARM64]
-    timeout-minutes: 30
-    steps:
-      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b
-      - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7
-        with:
-          go-version: "1.22"
-      - uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb
-      - name: Pull linkerd binary
-        run: |
-          TAG='${{ needs.tag.outputs.tag }}'
-          bin/docker-pull-binaries "$TAG"
-          CMD="$PWD/target/release/linkerd2-cli-$TAG-linux-arm64"
-          echo "CMD=$CMD" >> "$GITHUB_ENV"
-          "$CMD" version --client
-      - uses: extractions/setup-just@dd310ad5a97d8e7b41793f8ef055398d51ad4de6
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - uses: azure/setup-kubectl@3e0aec4d80787158d308d7b364cb1b702e7feb7f
-      - name: Setup k3d
-        shell: bash
-        run: |
-          mkdir -p "$PWD/target/bin"
-          PATH=$PATH:"$PWD/target/bin"
-          echo "PATH=$PATH" >> "$GITHUB_ENV"
-          bin/scurl "https://raw.githubusercontent.com/k3d-io/k3d/${{ env.K3D_VERSION }}/install.sh" \
-            | USE_SUDO=false K3D_INSTALL_DIR=$PWD/target/bin bash
-      - name: Cluster setup
-        run: |
-          CLUSTER_NAME=$(printf "${{ github.ref_name }}" | tr -c '[:alnum:]' -)
-          echo "CLUSTER_NAME=$CLUSTER_NAME" >> "$GITHUB_ENV"
-          just k3d-name="$CLUSTER_NAME" k3d-create
-          just k3d-name="$CLUSTER_NAME" k3d-use
-      - env:
-          RUN_ARM_TEST: 1
-          LINKERD_DOCKER_REGISTRY: ${{ env.DOCKER_REGISTRY }}
-        run: go test ./test/integration/deep/... --integration-tests --linkerd "$CMD"
-      - name: Delete cluster
-        if: always()
-        run: just k3d-name="$CLUSTER_NAME" k3d-delete
-
   choco_pack:
     # only runs for stable tags. The conditionals are at each step level instead of the job level
     # otherwise the jobs below that depend on this one won't run