🔧 Fixup codecov flag config

[burgholzer]

Description

It turns out that #154 did not properly configure the coverage flags as some header and source files got lost.
This PR tries to fix that and also unifies some of the configuration settings.

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. (C++ coverage is only lower due to the correct configuration)
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

Merging #155 (28d62d6) into main (7dc2a5c) will decrease coverage by 2.5%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main    #155     +/-   ##
=======================================
- Coverage   93.9%   91.4%   -2.6%     
=======================================
  Files         16      23      +7     
  Lines       1062    1875    +813     
  Branches     241     414    +173     
=======================================
+ Hits         998    1714    +716     
- Misses        64     161     +97     

Flag	Coverage Δ
cpp	91.2% <ø> (-2.9%)	⬇️
python	93.0% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/Architecture.hpp	87.0% <0.0%> (ø)
src/Architecture.cpp	95.2% <0.0%> (ø)
include/Mapper.hpp	58.0% <0.0%> (ø)
include/utils.hpp	83.3% <0.0%> (ø)
include/MappingResults.hpp	64.5% <0.0%> (ø)
src/utils.cpp	89.2% <0.0%> (ø)
src/Mapper.cpp	93.1% <0.0%> (ø)

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