temp: Remove Slack notification for on-call tickets

This needs to be updated to use our new Slack instance. Since the old Slack instance's engineering room was archived, this step is failing.

This will be added back in during an upcoming on-call week.

.github/workflows/add-GHrequest-to-team-board.yml

@@ -54,19 +54,4 @@ jobs:
             -H "Authorization: token $GITHUB_TOKEN" \
             --data '{ "body": "Thank you for your report! @openedx/axim-oncall will triage within a business day. Simple requests usually take 2-3 business days to resolve; more complex requests could take longer." }'
 
-      - name: Alert in Slack
-        id: slack
-        uses: slackapi/slack-github-action@v1.18.0
-        with:
-          channel-id: C02MB2TBKE3
-          # In the Slack message, we *could* just use ${{ github.event.issue.html_url }}.
-          # However, this creates a URL like:
-          #    https://github.com/openedx/axim-engineering/issues/NUMBER
-          # which Slack will expand into a preview, clogging up our Slack channel. Unfortunately, there is no way
-          # to disable github.com previews without disabling all GitHub previews in the entire workspace.
-          # However, if we build the URL like this:
-          #    https://www.github.com/openedx/axim-engineering/issues/NUMBER
-          # then the "www" trips up Slack enough so that it doesn't render the preview.
-          slack-message: "Incoming GitHub request: ${{ github.event.issue.title }}\nAuthor: ${{ github.event.issue.user.login }}\nURL: https://www.github.com/openedx/axim-engineering/issues/${{ github.event.issue.number }}"
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.SLACK_ISSUE_BOT_TOKEN }}
+