fix(cli): handle undefined enabledProviders

[cwoolum]

*Issue #, if available: #6285

*Description of changes: Handled the providers being undefined and also refactored a bit for readability. Added 4 unit tests as well

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jhockett]

LGTM! Thanks for the contribution @cwoolum!

[codecov]

Codecov Report

Merging #6293 (6d4bfa5) into master (450616e) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #6293      +/-   ##
==========================================
+ Coverage   57.03%   57.12%   +0.08%     
==========================================
  Files         469      471       +2     
  Lines       21514    21554      +40     
  Branches     4057     4066       +9     
==========================================
+ Hits        12271    12313      +42     
+ Misses       8383     8381       -2     
  Partials      860      860              

Impacted Files	Coverage Δ
...xtensions/amplify-helpers/service-select-prompt.ts	94.59% <100.00%> (ø)
...c/extensions/amplify-helpers/get-project-config.ts	100.00% <0.00%> (ø)
...extensions/amplify-helpers/get-provider-plugins.ts	83.33% <0.00%> (+66.66%)	⬆️

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[lgtm-com]

This pull request fixes 1 alert when merging 6d4bfa5 into 48604f6 - view on LGTM.com

fixed alerts:

• 1 for Unused variable, import, function or class

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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