Revert "ci: add slack release notification (#2497)"

This reverts commit e95c379.

.github/workflows/release.yaml

@@ -116,19 +116,3 @@ jobs:
           CHART_MUSEUM_URL: "https://charts.loft.sh/"
           CHART_MUSEUM_USER: ${{ secrets.CHART_MUSEUM_USER }}
           CHART_MUSEUM_PASSWORD: ${{ secrets.CHART_MUSEUM_PASSWORD }}
-
-  # The workflow will only trigger on non-draft releases
-  # https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#release
-  notify_release:
-    needs:
-      - get_version
-    runs-on: ubuntu-22.04
-    steps:
-      - name: Notify \#product-releases Slack channel
-        uses: loft-sh/github-actions/.github/actions/release-notification@v1
-        with:
-          version: ${{ needs.get_version.outputs.version }}
-          previous_tag: ${{ needs.get_version.outputs.previous_stable_version }}
-          target_repo: 'loft-sh/vcluster'
-          product: 'vCluster'
-          webhook_url: ${{ secrets.SLACK_WEBHOOK_URL_PRODUCT_RELEASES }}