Hide transfer URLs from Maven CI logs, upload test data to codecov

[leonardehrenfried]

Summary

Whenever I need to look at a CI log, I have to scroll past a very long list of URLs that Maven has downloaded and I never had any use from these at all.

For this reason I'm proposing to completely hide these URLs from the CI log.

On top of this, the PR also enables colour output for the CI logs and adds some Unicode characters.

It looks like this:

Coverage data aggregation

I also removed the hardcoded path to the coverage file and I hope that this will automatically lead to sub-module's coverage data being discovered.

Test data uploads

Codecov has a new feature where they allow you to upload test data, which I want to try out. It's doesn't work out of the box with JUnit yet, but I'm working on it: codecov/feedback#304 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.93%. Comparing base (507baef) to head (9063f93).
Report is 88 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6220   +/-   ##
==========================================
  Coverage      69.92%   69.93%           
- Complexity     17730    17733    +3     
==========================================
  Files           2000     2000           
  Lines          75487    75487           
  Branches        7727     7727           
==========================================
+ Hits           52787    52793    +6     
+ Misses         20015    20011    -4     
+ Partials        2685     2683    -2     

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