chore(): removed plugin scan messages & initialize new version messages

[renebrandel]

Description of changes

• removes the following messages but still prints errors if it encounters any:

renebrandel@renes-air Projects % amplify version
Initializing new Amplify CLI version...
Done initializing new version.
Scanning for plugins...
Plugin scan successful

Issue #, if available

Description of how you validated changes

• Tested it locally.

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

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

[codecov-commenter]

Codecov Report

Merging #7508 (2983ba9) into master (08f7a3c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7508   +/-   ##
=======================================
  Coverage   52.79%   52.79%           
=======================================
  Files         523      523           
  Lines       26137    26137           
  Branches     5113     5113           
=======================================
  Hits        13800    13800           
  Misses      11368    11368           
  Partials      969      969           

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[lgtm-com]

This pull request introduces 1 alert when merging 2983ba9 into 08f7a3c - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class