Drop support for JDK-11.
Retain bld support for existing JDK versions (17, 21).
Add support for JDK-25.
Remove the branches (1.17.x, 1.15.x, 1.x).  They are older code branchs
and have their own CI workflows.

Project code changes (e.g. security manager) needed for JDK-25 are 
not compatible with earlier JDK versions.  The workflow requires 
2 bld cases. One, for JDK-25 code and one for the others.
There is no convenient way to identify code changes for JDK-25.
To address this, file IsJdk24.txt must be present in the project
root directory of a branch with JDK-25 changes.  The CI workflow checks 
for the presence of the file to initiate a JDK-25 bld.
(See https://issues.redhat.com/browse/ELY-2961) 

JDK-24 will not be supported currently.  Also the windows-latest 
JDK-24 combination fails consistently. There is some issue with module 
wildfly-elytron-tool.