Simplify zwe init stc

[Martin-Zeithaml]

Following simplifications were made:

• ZWEISTC is using IKJEFT01 & REPRO
  • No need to change target names as done for IEBCOPY before
  • PROCLIB allocated with DISP=SHR
• Defaults are not checked

Note: this is for ZWEGEN00, the record must fit into 80 chars:

//STCZOWE DD DISP=SHR,
// DSN=&PROCLIB.({zowe.setup.security.stcs.zowe})

As the first template variable is changed, the result will not fit into 80 chars:

//STCZOWE DD DISP=SHR,
// DSN={zowe.setup.dataset.proclib}.({zowe.setup.security.stcs.zowe})
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
// DSN=----+----1----+----2----+----3----+----4----.({zowe.setup.security.stcs.zowe})

Testing in progress...

[github-actions]

build 7032 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/13391253965