build: Remove angle brackets from workflow error message (#1269)

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