Improve codecov results

[DRovara]

Description

Some parts of the codebase were incorrectly ignored from codecov. The codecov-ignored directives are updated in this pull request.

Further, this PR adds tests for parsing assertions and for equality assertions.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.8%. Comparing base (7469237) to head (6bf82f4).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff            @@
##            main      #9      +/-   ##
========================================
+ Coverage   70.4%   81.8%   +11.3%     
========================================
  Files         13      12       -1     
  Lines       1599    1449     -150     
  Branches     229     194      -35     
========================================
+ Hits        1127    1186      +59     
+ Misses       472     263     -209     

Flag	Coverage Δ		*Carryforward flag
cpp	92.1% <100.0%> (+14.1%)	⬆️
python	18.7% <ø> (ø)		Carriedforward from 7469237

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
include/common/parsing/AssertionParsing.hpp	100.0% <ø> (ø)
src/backend/dd/DDSimDebug.cpp	89.0% <ø> (+5.9%)	⬆️
src/common/parsing/AssertionParsing.cpp	96.0% <100.0%> (+32.0%)	⬆️

... and 2 files with indirect coverage changes