Changes

ci(pipelines): update cloudevents server URL (#4473)

This pull request makes a small but important update to the
`sendTestCaseRunReport` function in
`libraries/tipipeline/vars/prow.groovy`. The change updates the URL used
to send test case run reports to the new cloudevents server endpoint.

- Changed the cloudevents server URL in the `curl` command from
`https://internal2-do.pingcap.net/cloudevents-server/events` to
`https://cloudevents-server.cs.svc/events` to use the new endpoint.
 (commit: 10ba83a)