Add skip clause for Public API check

Fixes open-telemetry#2800

Author: ocelotl

.github/workflows/generate_workflows_lib/src/generate_workflows_lib/misc.yml.j2

@@ -25,6 +25,11 @@ jobs:
       !contains(github.event.pull_request.labels.*.name, 'Skip generate-workflows')
       && github.actor != 'opentelemetrybot'
     {%- endif %}
+    {%- if job_data == "public-symbols-check" %}
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'Approve Public API check')
+      && github.actor != 'opentelemetrybot'
+    {%- endif %}
     steps:
       - name: Checkout repo @ SHA - ${% raw %}{{ github.sha }}{% endraw %}
         uses: actions/checkout@v4