Validate zOSMF clean up [WIP]

[Martin-Zeithaml]

Fixes #3932

Function bin/libs/zosmf.ts: validateZosmfAsAuthProvider and the corresponding shell version is evaluating the default setting as an error:

ERROR: z/OSMF is not configured. Using z/OSMF as authentication provider is not supported. 

Tests

When ZOSMF_HOST and ZOSMF_PORT are defined:

With valid values:

Successfully checked z/OS MF is available on 'https://skynet:800/zosmf/info'

With invalid values:

ERROR: Warning: Could not validate if z/OS MF is available on 'https://skinet:800/zosmf/'. No response code from z/OSMF server.  
ERROR: 2024-08-16 08:09:10 <ZWELS:800> ZWESVUSR ERROR (zwe-internal-start-prepare,global_validate) Zosmf validation failed

[github-actions]

build 5758 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10404242866

[github-actions]

Test workflow 5145 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/2.18.0-PR-3943/zowe-2.18.0-pr-3943-5758-20240815131028.pax
Running on machine: zzow08
Result: SUCCESS
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10404340747