Add and expand e2e tests for k6 run --out cloud and k6 cloud

[na--]

This PR only has tests of the existing behavior, it doesn't have any actual code changes. Those will come in a separate PR.

[codecov-commenter]

Codecov Report

Merging #2864 (106404d) into master (4b82b55) will increase coverage by 0.85%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2864      +/-   ##
==========================================
+ Coverage   76.04%   76.89%   +0.85%     
==========================================
  Files         217      217              
  Lines       16604    16604              
==========================================
+ Hits        12626    12768     +142     
+ Misses       3201     3029     -172     
- Partials      777      807      +30     

Flag	Coverage Δ
ubuntu	76.74% <ø> (+0.84%)	⬆️
windows	76.59% <ø> (+0.81%)	⬆️

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

Impacted Files	Coverage Δ
api/v1/status_routes.go	51.02% <0.00%> (-4.09%)	⬇️
metrics/metric_type.go	78.94% <0.00%> (-3.51%)	⬇️
lib/executor/vu_handle.go	95.32% <0.00%> (+1.86%)	⬆️
core/local/local.go	91.91% <0.00%> (+2.20%)	⬆️
cloudapi/config.go	88.88% <0.00%> (+2.22%)	⬆️
lib/execution.go	92.66% <0.00%> (+2.75%)	⬆️
cmd/ui.go	69.89% <0.00%> (+4.08%)	⬆️
api/v1/metric.go	68.18% <0.00%> (+4.54%)	⬆️
cloudapi/api.go	47.72% <0.00%> (+23.86%)	⬆️
cmd/cloud.go	70.94% <0.00%> (+57.54%)	⬆️

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[codebien]

LGTM