build: Remove angle brackets from workflow error message

Opsgenie doesn't handle angle brackets properly, so work around them by
removing all punctuation from around the URL. (I already raised this with
their support folks, but they consider this a wontfix.)

Also move it to another line for readability in diffs.

.github/workflows/provisioning-tests.yml

@@ -92,7 +92,8 @@ jobs:
            to: [email protected]
            from: github-actions <[email protected]>
            body: |
-             Devstack provisioning tests in ${{github.repository}} for ${{matrix.services}} failed! For details see <https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}>.
+             Devstack provisioning tests in ${{github.repository}} for ${{matrix.services}} failed!
+             For details, see https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}
              Runbook url: https://2u-internal.atlassian.net/wiki/spaces/AT/pages/16384920/Failure+Devstack+provisioning+tests+-+Runbook
 
       - name: close alerts on success