fix: change scope of change detection for python layers

[attilah]

Description of changes

Change the scope of files the CLI checks for python lambda layers.

Now in the layer directory the following files are checked:

• Pipfile (if exists)
• Pipfile.lock (if exists)
• All other files recursively, but exluding lib - where pip install installs the dependencies

Issue #, if available

N/A

Description of how you validated changes

Manual testing

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 #7545 (66c80e2) into master (c3f4128) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7545   +/-   ##
=======================================
  Coverage   52.77%   52.77%           
=======================================
  Files         523      523           
  Lines       26155    26155           
  Branches     5117     5117           
=======================================
  Hits        13804    13804           
  Misses      11382    11382           
  Partials      969      969           

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[github-actions]

👋 Hi, this pull request was referenced in the v5.0.1 release!

Check out the release notes here https://github.com/aws-amplify/amplify-cli/releases/tag/v5.0.1.