[Merged by Bors] - Use gotestsum in system tests

[fasmat]

Motivation

gotestsum can be used to run a compiled test binary and parse its output which would allow us to use it for system tests as well.

Description

Updated the Dockerfile and Makefile of system tests to use gotestsum as runner for the tests.

Test Plan

existing tests pass.

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.0%. Comparing base (bdb32e2) to head (6583c73).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6230     +/-   ##
=========================================
- Coverage     82.1%   82.0%   -0.1%     
=========================================
  Files          309     309             
  Lines        34120   34120             
=========================================
- Hits         28015   27999     -16     
- Misses        4328    4340     +12     
- Partials      1777    1781      +4     

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[fasmat]

bors try

[spacemesh-bors]

try

Build failed:

• ci-status

[fasmat]

bors merge

[spacemesh-bors]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status