Set K6_CLOUD_TRACES_ENABLED to true by default

[Blinkuu]

What?

This commit updates the default value of the tracesEnabled option, enabling it by default.

Why?

We hope this change can help drive ease of use of the Distributed Tracing in Grafana Cloud k6 feature.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make ci-like-lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

Enables request metadata output (#3201, #3202) by default.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (43f10a0) 73.12% compared to head (fdd55e4) 73.13%.

❗ Current head fdd55e4 differs from pull request most recent head f22f3e3. Consider uploading reports for the commit f22f3e3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3398      +/-   ##
==========================================
+ Coverage   73.12%   73.13%   +0.01%     
==========================================
  Files         258      258              
  Lines       19642    19642              
==========================================
+ Hits        14363    14365       +2     
+ Misses       4397     4395       -2     
  Partials      882      882              

Flag	Coverage Δ
ubuntu	73.06% <100.00%> (ø)
windows	72.98% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
cloudapi/config.go	90.90% <100.00%> (ø)

... and 1 file with indirect coverage changes

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