chore: Add exceptions for markdown check (#7078)

* rename and run slack step on failure

* add exceptions

.github/workflows/cron-weekly.yaml

@@ -1,4 +1,4 @@
-name: Markdown Links Check
+name: Weekly Cron
 # runs every monday at 9 am
 on:
   schedule:
@@ -19,10 +19,11 @@ jobs:
         with:
           use-quiet-mode: "yes"
           use-verbose-mode: "yes"
-          config-file: ".github/workflows/markdown.links.config.json"
+          config-file: ".github/workflows/mlc_config.json"
           folder-path: "docs/"
 
       - name: Send Slack notification
+        if: failure()
         run: |
           curl -X POST -H 'Content-type: application/json' -d '{"msg":"Broken links found in the documentation. Please check the logs at ${{ env.LOGS_URL }}"}' ${{ secrets.DOCS_LINK_SLACK_WEBHOOK }}
           echo "Sent Slack notification"