test: remove redundant formatter tests

[lars-reimann]

Closes #745

Summary of Changes

Formatting tests were difficult to maintain since several tests were testing the same rules in different contexts, including the formatting for

• lists of constraints,
• lists of parameters,
• lists of results,
• lists of type parameter,
• classes (global vs. nested),
• enum (global vs. nested),
• functions (global vs. method).

This made changes and additions cumbersome. This PR extracts the tests for these rules and removes the redundant ones.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.07s

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[codecov]

Codecov Report

Merging #747 (738b7c2) into main (fe1a115) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #747   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           80        80           
  Lines        11211     11211           
  Branches      2341      2341           
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  Hits         11211     11211