Replace lodash _.first with native array[0]

[chrisVillanueva]

Addresses: #7747

[codecov-commenter]

Codecov Report

Merging #7816 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #7816   +/-   ##
=======================================
  Coverage   88.21%   88.21%           
=======================================
  Files         245      245           
  Lines        9307     9307           
=======================================
  Hits         8210     8210           
  Misses       1097     1097           

Impacted Files	Coverage Δ
...s/package/compile/events/apiGateway/lib/apiKeys.js	94.73% <100.00%> (ø)
...age/compile/events/apiGateway/lib/usagePlanKeys.js	97.05% <100.00%> (ø)

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[medikoo]

Thank you @chrisVillanueva looks great!