chore: replace _.forEach with Object.entries().forEach

[pgrzesik]

Replace _.forEach with Object.entries().forEach + one missed toPairs usage to reduce dependency on lodash.

Additional note: Unless I'm missing something, there are no instances of _.each left as well.

Addresses: #7747

[codecov-commenter]

Codecov Report

Merging #8280 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #8280      +/-   ##
==========================================
+ Coverage   88.02%   88.03%   +0.01%     
==========================================
  Files         248      248              
  Lines        9312     9321       +9     
==========================================
+ Hits         8197     8206       +9     
  Misses       1115     1115              

Impacted Files	Coverage Δ
lib/classes/CLI.js	93.36% <100.00%> (+0.03%)	⬆️
lib/classes/PluginManager.js	96.53% <100.00%> (+0.06%)	⬆️
lib/classes/Service.js	85.48% <100.00%> (ø)
lib/plugins/aws/info/display.js	81.92% <100.00%> (-0.22%)	⬇️
lib/plugins/aws/lib/normalizeFiles.js	100.00% <100.00%> (ø)
...ins/aws/package/compile/events/alb/lib/validate.js	97.82% <100.00%> (ø)
.../aws/package/compile/events/apiGateway/lib/cors.js	100.00% <100.00%> (ø)
...kage/compile/events/apiGateway/lib/method/index.js	100.00% <100.00%> (ø)
...ompile/events/apiGateway/lib/method/integration.js	98.33% <100.00%> (ø)
.../compile/events/apiGateway/lib/method/responses.js	100.00% <100.00%> (ø)
... and 8 more

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[medikoo]

Thank you @pgrzesik !

Additional note: Unless I'm missing something, there are no instances of _.each left as well.

Yes it appears, those were renamed to _.forEach with #7748 I'll update the doc