Fix coverage report to include all executed tests

[ddoktorski]

Closes #1212

Introduced changes

• Fix poe test command to run all non-docs tests and print coverage report
• Remove some poe test tasks that would always fail for some tests
• Fix omit config for coverage to exclude all test files
• Move some common pytest options to addopts config

Note: Regarding poe test tasks, this PR is just a small improvement. I think the actual refactoring of test commands should be done after GatewayClient deprecation (#1047).

• This PR contains breaking changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7aaaf3a) 97.47% compared to head (f4fea23) 98.05%.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #1213      +/-   ##
===============================================
+ Coverage        97.47%   98.05%   +0.57%     
===============================================
  Files               92       90       -2     
  Lines             4749     4719      -30     
===============================================
- Hits              4629     4627       -2     
+ Misses             120       92      -28     

see 7 files with indirect coverage changes

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