WIP - UI Tests in nodejs

[DonJayamanne]

For #

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Appropriate comments and documentation strings in the code
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)
• The wiki is updated with any design decisions/details.

[codecov-io]

Codecov Report

Merging #6717 into master will increase coverage by <.01%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master    #6717      +/-   ##
==========================================
+ Coverage   58.56%   58.56%   +<.01%     
==========================================
  Files         494      494              
  Lines       21785    21799      +14     
  Branches     3489     3493       +4     
==========================================
+ Hits        12758    12767       +9     
- Misses       8238     8240       +2     
- Partials      789      792       +3

Impacted Files	Coverage Δ
src/client/testing/display/main.ts	81.1% <100%> (ø)	⬆️
src/client/common/constants.ts	100% <100%> (ø)	⬆️
src/client/common/process/logger.ts	86.95% <50%> (-13.05%)	⬇️
.../client/activation/languageServer/outputChannel.ts	88.23% <81.81%> (-11.77%)	⬇️

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