Excludes drake from codecov.

[francocipollone]

🦟 Bug fix

Summary

• Drake namespace is a copy-paste from drake repository and therefore we don't have tests for those methods. So, this isn't representative of the code coverage of maliput.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if it affects the public API)

[codecov]

Codecov Report

Merging #599 (734f239) into main (65e0571) will increase coverage by 26.89%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #599       +/-   ##
===========================================
+ Coverage   59.18%   86.08%   +26.89%     
===========================================
  Files         350      229      -121     
  Lines       16535    10374     -6161     
===========================================
- Hits         9786     8930      -856     
+ Misses       6749     1444     -5305     

see 579 files with indirect coverage changes

[agalbachicar]

LGTM