Mitigate impact of changing master to main

[edburns]

@edburns requested branch master rename to main before proper notification.

https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/issues/3122

This issue seeks to identify collect, and track the mitigation of anything that breaks as a result of this change.

AB#48

[ivargrimstad]

Verify (and update) the Jenkins jobs in case they have a hardcoded reference to master

https://ci.eclipse.org/jakartaee-platform/

[edburns]

Also need to move master to main on

• https://github.com/jakartaee/jakartaee-api
• https://github.com/jakartaee/jakartaee-schemas

[edburns]

Ed and Arjan will meet in a separate forum to assess the job to be done to fix it.
Werner: The GH pages are affected: https://eclipse-ee4j.github.io/jakartaee-platform/ fix the README