fix: CodeCov .yml enhancements

[abanuelo]

Description

Adding the following changes to codecov.yml:

• yml was incorrectly formatted (ie ran curl -X POST --data-binary @codecov.yml https://codecov.io/validate to verify that)
• Readjusting patch thresholds to reduce noisy failures
• regexes being applied to ignore certain simulator paths were incorrect. I decided to just list all those src/simulators folders to ignore
• ignoring coverage on the test directory.
• Increasing the difference threshold for project status to 5% given that we report "green" on anything that ranges between 70...100
• Ignore coverage on any non-Python file

Issue Link

N/A

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.12%. Comparing base (308c351) to head (0f2dbfe).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   86.19%   91.12%   +4.93%     
==========================================
  Files         144       54      -90     
  Lines       25041    13478   -11563     
==========================================
- Hits        21583    12282    -9301     
+ Misses       3458     1196    -2262     

see 94 files with indirect coverage changes