Update _link_check.yml

Author: shoumikhin

.github/workflows/_link_check.yml

@@ -7,6 +7,7 @@ on:
 
 jobs:
   lint-urls:
+    if: ${{ github.event_name != 'pull_request' || !contains(github.event.pull_request.labels.*.name, 'skip-url-lint') }}
     uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
     with:
       runner: linux.2xlarge
@@ -24,6 +25,7 @@ jobs:
         )
 
   lint-xrefs:
+    if: ${{ github.event_name != 'pull_request' || !contains(github.event.pull_request.labels.*.name, 'skip-xref-lint') }}
     uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
     with:
       runner: linux.2xlarge