Do not create PEM by default

[1000TurquoisePogs]

Depends upon zowe/zlux-server-framework#596

Because zowe/zlux-server-framework#596 is adding PKCS12 support to the app-server, the only known server that used the PEM files zwe creates no longer needs them.
As PEM is generally not recommended to use, this change both allows them to not exist, and changes zwe to not create them by default.
Those that really need them can still create them via zwe init --create-pem.

[github-actions]

build 7215 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/13978024169

[github-actions]

Test workflow 6273 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/3.2.0-PR-4241/zowe-3.2.0-pr-4241-7215-20250320194911.pax
Running on machine: zzow11
Result: CANCELLED
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/13978098439

[github-actions]

build 7392 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/14323495004

[github-actions]

Test workflow 6385 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/3.2.0-PR-4241/zowe-3.2.0-pr-4241-7392-20250408021217.pax
Running on machine: zzow11
Result: FAILURE
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/14323569639

[github-actions]

build 7865 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/15585001414

[github-actions]

build 7866 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/15585031433

[github-actions]

Test workflow 6760 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/3.3.0-PR-4241/zowe-3.3.0-pr-4241-7865-20250611124009.pax
Running on machine: zzow11
Result: FAILURE
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/15585131708

[github-actions]

Test workflow 6761 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/3.3.0-PR-4241/zowe-3.3.0-pr-4241-7866-20250611124126.pax
Running on machine: zzow11
Result: FAILURE
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/15585158372