Clean up the code when checking z/OSMF [v2]

[Martin-Zeithaml]

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PR type

What type of changes does your PR introduce to Zowe? Put an x in the box that applies to this PR. If you're unsure about any of them, don't hesitate to ask.

• Bugfix

Relevant issues

Fixes #3932

Changes proposed in this PR

• Error message ZWEL0141E contains a text $(get_user_id) instead of real userID
• When checking z/OSMF connection, some conditions are checked twice
• This error message does not make sense z/OSMF is not configured. Using z/OSMF as authentication provider is not supported.
  • If zOSMF is configured
  • If default setting of authentication provider is used

Does this PR introduce a breaking change?

• No

Testing

Always this setting:

zowe:
  environments:
    ZOSMF_HOST: example.com
    ZOSMF_PORT: 1234

With or without fix, if discovery.enabled=true:
Successfully checked z/OS MF is available on 'https://example.com:1234/zosmf/info'

But when this is set:

components.discovery.enabled=false
components.gateway.apiml.security.auth.provider=zosmf

No fix, confusing error message is printed and the zowe continues:
ERROR: z/OSMF is not configured. Using z/OSMF as authentication provider is not supported.

With fix, error with reason is printed and zowe is terminated:

ERROR: Using z/OSMF as 'components.gateway.apiml.security.auth.provider' is not possible: discovery is disabled. 
ERROR: 2024-09-06 07:21:53 <ZWELS:67504334> martin ERROR (zwe-internal-start-prepare,global_validate) Zosmf validation failed 

[github-actions]

build 5892 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10683515173

[github-actions]

build 5893 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10683572940

[github-actions]

build 5951 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10740004312

[github-actions]

Test workflow 5321 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/2.18.1-PR-3971/zowe-2.18.1-pr-3971-5951-20240906142500.pax
Running on machine: zzow07
Result: SUCCESS
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/10740123791