Make metric.getName() into metric.name

[mstoykov]

The original change was proposed in #2053 and implemented in #2058

[codecov-commenter]

Codecov Report

Merging #2076 (d19c491) into master (2039c56) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

❗ Current head d19c491 differs from pull request most recent head 20c22d9. Consider uploading reports for the commit 20c22d9 to get more accurate results

@@            Coverage Diff             @@
##           master    #2076      +/-   ##
==========================================
- Coverage   72.15%   72.12%   -0.04%     
==========================================
  Files         181      181              
  Lines       14283    14289       +6     
==========================================
  Hits        10306    10306              
- Misses       3351     3355       +4     
- Partials      626      628       +2     

Flag	Coverage Δ
ubuntu	72.08% <50.00%> (+0.01%)	⬆️
windows	71.75% <50.00%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
js/modules/k6/metrics/metrics.go	81.81% <50.00%> (-10.78%)	⬇️
lib/executor/vu_handle.go	94.39% <0.00%> (-0.94%)	⬇️
js/runner.go	81.86% <0.00%> (-0.54%)	⬇️
lib/netext/httpext/request.go	93.93% <0.00%> (+0.60%)	⬆️

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[na--]

LGTM, though please squash when/before merging