Tailor SCS error message for the OS

[gejohnston]

Is your feature or enhancement request related to a problem or limitation? Please describe

A failure to save credentials displays an error message that includes instructions which may not apply on the OS on which you are running.

Describe your enhancement idea

The following command failure shows the existing message.

$ zowe auth login apiml --user YourUserName--password YourPassword
Unable to perform this operation due to the following problem.
Unable to securely save credentials.

Diagnostic Information
Possible Solutions:
 - Reinstall Zowe CLI. On Linux systems, also make sure to install the prerequisites listed in Zowe CLI documentation.
 - Ensure Zowe CLI can access secure credential storage. Zowe CLI needs access to the OS to securely save credentials.
 - Instead of secure storage, rerun this command with the "--show-token" flag to print the token to console. Store the token in an environment variable ZOWE_OPT_TOKEN_VALUE to use it in future commands.

• When on Windows, the Linux instructions are irrelevant.
• However, when on Windows, we could alternatively instruct the user that if their secure vault is corrupt, they could remove the "Windows Credentials - Zowe/secure_config_props" entry from Windows Credential Manager and try again.

Summary: Some of the "Possible Solutions" should be displayed conditionally based on the OS on which the user is running.

Describe alternatives you've considered

Provide any additional context

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