Remove support for tomcat 7 from role
End of Life for tomcat 7 was in march 2021 - https://tomcat.apache.org/tomcat-70-eol.html
We don't use it anywhere, so the support can be safely removed.
Tests also has to be updated, there are asserts checking for tomcat7 in the CI jobs.
https://git.app.uib.no/uib-ub/drift/roller-ansible/tomcat-centos8/-/jobs/336046