Immediately shutdown k6 cloud on second sig-c signal

[theerapatcha]

Trap signal and handle second sig-c to shutdown k6 cloud immediately

Closes #1530

[codecov-commenter]

Codecov Report

Merging #1647 into master will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1647      +/-   ##
==========================================
- Coverage   72.16%   72.11%   -0.06%     
==========================================
  Files         166      166              
  Lines       12787    12794       +7     
==========================================
- Hits         9228     9226       -2     
- Misses       3009     3018       +9     
  Partials      550      550              

Impacted Files	Coverage Δ
cmd/cloud.go	6.52% <0.00%> (-0.26%)	⬇️
lib/testutils/minirunner/minirunner.go	81.39% <0.00%> (-4.66%)	⬇️

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[na--]

Thanks for this! At a quick glance, it looks very good, but I'd like to test the new code as well before giving it the final 👍

[na--]

LGTM, tested it as well and everything seems fine, thanks again!

[na--]

Please fix the race condition reported in #1647 (comment)

[codecov-io]

Codecov Report

Merging #1647 into master will increase coverage by 0.17%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1647      +/-   ##
==========================================
+ Coverage   72.16%   72.33%   +0.17%     
==========================================
  Files         166      176      +10     
  Lines       12787    13539     +752     
==========================================
+ Hits         9228     9794     +566     
- Misses       3009     3132     +123     
- Partials      550      613      +63     

Flag	Coverage Δ
ubuntu	72.30% <0.00%> (?)
windows	70.86% <0.00%> (?)

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

Impacted Files	Coverage Δ
cmd/cloud.go	6.62% <0.00%> (-0.15%)	⬇️
stats/statsd/collector.go	65.21% <0.00%> (-34.79%)	⬇️
stats/datadog/collector.go	74.19% <0.00%> (-25.81%)	⬇️
cmd/options.go	60.46% <0.00%> (-2.73%)	⬇️
lib/testutils/httpmultibin/httpmultibin.go	89.88% <0.00%> (-2.52%)	⬇️
js/runner.go	80.13% <0.00%> (-2.14%)	⬇️
lib/netext/dialer.go	93.75% <0.00%> (-2.00%)	⬇️
js/modules/k6/http/request.go	80.64% <0.00%> (-0.07%)	⬇️
cmd/collectors.go	0.00% <0.00%> (ø)
stats/system_tag.go	83.05% <0.00%> (ø)
... and 28 more

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[na--]

LGTM, though the old shouldExitLoop behavior would have been better than a direct break of the loop, since now we won't update the progress (testProgress = newTestProgress), but we can fix that later in another PR.