Additional test label for jdk20+

[sophia-guo]

JDK20+ won't run on anything earlier than about RHEL7 . Tests need to be limited to run on RHEL7 ( if it's hit a RHEL6/CentOS6 box that could be the problem ).

@sxa

[sxa]

SGTM - can you make the changes to add in the exclusion for machines with the appropriate labels in the pipelines?

[Haroon-Khel]

Tests need to be limited to run on RHEL7

Do you mean RHEL7+ or does this mean they cannot be run on RHEL/Centos 8?

[sxa]

It will be fine on 8+. This is due to the glibc version on RHEL6 being too low for JDK21+ since we switched that version for x64 to build on RHEL7. The goal here is to stop it running on any Centos/RHEL6 system. They must still be able to run on other distributions (AFAIK all of our other ones in the CI are of a suitable glibc level - you can see which is in each on our platforms wiki page)