Update xk6-output-prometheus-remote to its latest main commit

[na--]

What?

This allows us to make all metrics.TrendSink properties private and finish that refactoring effort. It is built on top of grafana/xk6-output-prometheus-remote#133, and both are the continuation of the metrics.TrendSink refactoring that started in #3191.

All of this rigmarole and complexity with multiple PRs was needed simply because of how experimenal modules from external repositories work 😞

Why?

All of these PRs are needed if we want to have HDR histograms or to support metrics in distributed k6 execution. Being able to access the internal struct properties directly anywhere in k6 (or outside of it, as was the case here!) prevented us from refactoring these "internals".

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)

• Use HDR histograms for calculating percentiles in thresholds and summary stats #763
• Clustering and distributed execution #140
• Update the k6 dependency to the latest master version xk6-output-prometheus-remote#133
• Refactor various metric APIs to make distributed execution easier #3191

[codecov-commenter]

Codecov Report

Merging #3210 (e7e2141) into master (1278f6e) will increase coverage by 0.17%.
The diff coverage is 89.84%.

❗ Current head e7e2141 differs from pull request most recent head 11349b3. Consider uploading reports for the commit 11349b3 to get more accurate results

@@            Coverage Diff             @@
##           master    #3210      +/-   ##
==========================================
+ Coverage   72.69%   72.87%   +0.17%     
==========================================
  Files         254      259       +5     
  Lines       19802    19810       +8     
==========================================
+ Hits        14396    14437      +41     
+ Misses       4497     4473      -24     
+ Partials      909      900       -9     

Flag	Coverage Δ
ubuntu	72.81% <89.84%> (?)
windows	72.71% <89.84%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
metrics/engine/ingester.go	91.48% <ø> (ø)
output/cloud/expv2/collect.go	92.59% <ø> (+0.51%)	⬆️
output/cloud/expv2/flush.go	91.04% <ø> (-0.85%)	⬇️
output/cloud/expv2/output.go	65.55% <14.28%> (-0.20%)	⬇️
cmd/run.go	74.27% <86.66%> (+0.11%)	⬆️
output/cloud/insights/collect.go	91.48% <91.48%> (ø)
metrics/sink.go	97.40% <96.42%> (+1.51%)	⬆️
cloudapi/config.go	90.90% <100.00%> (ø)
execution/scheduler.go	93.09% <100.00%> (+0.36%)	⬆️
metrics/engine/engine.go	90.26% <100.00%> (+1.28%)	⬆️
... and 4 more

... and 12 files with indirect coverage changes

[olegbespalov]

🚀