Add flag to chromium to use single process

[joshuali925]

Issue #, if available:
#265

Description of changes:

• Add '--no-zygote', '--single-process' flags when Puppeteer launches chromium to reduce number of processes and memory usage

Did some testing on MacOS, Windows, Amazon Linux 2, Ubuntu and didn't find side effects

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #268 (ba95631) into dev (a047d10) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #268   +/-   ##
=======================================
  Coverage   74.91%   74.91%           
=======================================
  Files          32       32           
  Lines        1754     1754           
  Branches      340      340           
=======================================
  Hits         1314     1314           
  Misses        435      435           
  Partials        5        5           

Impacted Files	Coverage Δ
...r/routes/utils/visual_report/visualReportHelper.ts	83.92% <ø> (ø)

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