TD: Leverage the isCredManagerAvailablefunction

[zFernand0]

Is your feature request related to a problem? Please describe.

This is mostly for performance related reasons. 😋

Describe the solution you'd like

I'd love to see Zowe Explorer avoid doing unnecessary IO operations, and leverage the isCredManagerAvailable function instead 😋

Describe alternatives you've considered

Continue calling readProfilesFromDisk 😅

Additional context

N/A

[github-actions]

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