fix: Set console log level to the application one when writing to file

[mstoykov]

This fixes console.debug() messages printing with --console-output file.txt and -v given to k6 cli.

This already works when it isn't redirected to a file as it goes through the application wide logger.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6e2c8e8) 72.94% compared to head (3457a25) 72.80%.

❗ Current head 3457a25 differs from pull request most recent head 15b9e77. Consider uploading reports for the commit 15b9e77 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3380      +/-   ##
==========================================
- Coverage   72.94%   72.80%   -0.15%     
==========================================
  Files         261      259       -2     
  Lines       20018    20019       +1     
==========================================
- Hits        14603    14575      -28     
- Misses       4488     4509      +21     
- Partials      927      935       +8     

Flag	Coverage Δ
ubuntu	?
windows	72.80% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
js/console.go	94.28% <100.00%> (+0.16%)	⬆️
js/runner.go	84.90% <100.00%> (+0.06%)	⬆️

... and 11 files with indirect coverage changes

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[codebien]

IMHO, we should address #2968 and apply the fix at the same time. I can do an attempt as this is marked as v0.48.0.

[mstoykov]

I only made this fix as investigating the issue directly pointed out a 3 lines fix.

The other issue has multiple things in it and even just the os.OpenFile one still seems like a thing that will take quite a big refactor not to speak adding and e2e test will be a lot more work./

So I still prefer to fix this now and leave the other issue for when we have more time or more of the problems have been resolved for other reasons.