Disable JIRA worklog notifications for GitHub PRs

Reduce noise and avoid receiving the same notification multiple times.

Currently we receive the notification from three places:
* jira@apache.org
* notifications@github.com
* commits@calcite.apache.org

After the changes the jira@apache.org goes away.

Full discussion here:
https://lists.apache.org/thread/k9lvps6x79sgcdgmrz5dcxkqmyc2b2gn

Close apache#3166

.asf.yaml

@@ -32,4 +32,4 @@ notifications:
     commits:      commits@calcite.apache.org
     issues:       issues@calcite.apache.org
     pullrequests: commits@calcite.apache.org
-    jira_options: link label worklog
+    jira_options: link label