chore: exclude build and example folders from coverage

[mojomex]

PR Type

• Improvement

Related Links

• Codecov before

Description

This PR removes the build and nebula_examples folders from code coverage statistics.
The build folder contains the code-generation results from nebula_msgs etc. and should not be included (also, it's 9000 lines 🤯).
The nebula_examples folder is not part of the main functionality of the software and thus, coverage is not important.

Review Procedure

Compare coverage results from before and after given the links above and confirm that

• the directories are removed
• all other relevant directories are present and correct

Pre-Review Checklist for the PR Author

PR Author should check the checkboxes below when creating the PR.

• Assign PR to reviewer

Checklist for the PR Reviewer

Reviewers should check the checkboxes below before approval.

• Commits are properly organized and messages are according to the guideline
• (Optional) Unit tests have been written for new behavior
• PR title describes the changes

Post-Review Checklist for the PR Author

PR Author should check the checkboxes below before merging.

• All open points are addressed and tracked via issues or tickets

CI Checks

• Build and test for PR: Required to pass before the merge.