cmd: add custom number of validators beacon simulation test

[KaloyanTanev]

• Add a custom number of validators beacon simulation test, so users can test for their specific scenario.
• Fix some test names inconsistencies
• Improve the charon test all UX - print results to terminal after all tests complete
• Add missed MEV load test check
• Move the test command out of alpha state 🎉

category: feature
ticket: none

[codecov]

Codecov Report

Attention: Patch coverage is 57.39645% with 72 lines in your changes missing coverage. Please review.

Project coverage is 57.30%. Comparing base (eba4d33) to head (8122ad1).

Files with missing lines	Patch %	Lines
cmd/testbeacon.go	53.03%	31 Missing ⚠️
cmd/testall.go	0.00%	23 Missing ⚠️
cmd/cmd.go	0.00%	8 Missing ⚠️
cmd/testpeers.go	78.94%	4 Missing ⚠️
cmd/testinfra.go	88.88%	2 Missing ⚠️
cmd/testmev.go	90.47%	2 Missing ⚠️
cmd/testvalidator.go	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3385      +/-   ##
==========================================
- Coverage   57.34%   57.30%   -0.05%     
==========================================
  Files         217      217              
  Lines       31964    32028      +64     
==========================================
+ Hits        18330    18353      +23     
- Misses      11740    11781      +41     
  Partials     1894     1894              

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[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud