Replace FluentAssertions w/ Shouldly

[MooVC]

Pull Request

Description

Please provide a brief description of the changes you have made, including the problem this PR solves, or the feature it implements.

• Type of change: Refactoring
• Related issues: Update ownership and license fluentassertions/fluentassertions#2943

Migration from FluentAssertions to Shouldly. There is no functional change to Fluentify in this push.

Checklist

Please ensure the following are true for your PR:

• I have followed the project's coding style guidelines.
• I have added tests that prove my fix is effective or that my feature works.
• I have verified that new and existing unit tests pass locally with my changes.
• I have updated the documentation (if applicable).
• I have confirmed that my code is free from warnings and errors.
• I have reviewed suggestions and determined no actions is required.
• I have updated the CHANGELOG.md
• I have performed a self-review of my code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.15%. Comparing base (433fb56) to head (9109566).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   97.15%   97.15%           
=======================================
  Files         108      108           
  Lines        1300     1300           
  Branches      112      112           
=======================================
  Hits         1263     1263           
  Misses         15       15           
  Partials       22       22           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jcfnomada]

Please consider the possibility to use https://github.com/AwesomeAssertions/AwesomeAssertions