Temporarily disable flask (experimental debugger) test on AppVeyor

[DonJayamanne]

Temporary work around for #1565

This is a temporary work around is to ensure CI tests pass and we do not block other PRs (as a result of failing CI tests)

This pull request:

• Has a title summarizes what is changing

[codecov]

Codecov Report

Merging #1566 into master will decrease coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1566      +/-   ##
==========================================
- Coverage   71.65%   71.43%   -0.23%     
==========================================
  Files         273      273              
  Lines       12700    12700              
  Branches     2282     2282              
==========================================
- Hits         9100     9072      -28     
- Misses       3464     3492      +28     
  Partials      136      136

Impacted Files	Coverage Δ
src/client/linters/errorHandlers/notInstalled.ts	33.33% <0%> (-61.12%)	⬇️
src/client/linters/errorHandlers/errorHandler.ts	77.77% <0%> (-22.23%)	⬇️
src/client/common/logger.ts	53.33% <0%> (-20.01%)	⬇️
src/client/common/application/applicationShell.ts	23.07% <0%> (-7.7%)	⬇️
src/client/common/installer/productInstaller.ts	60.31% <0%> (-4.24%)	⬇️
src/client/linters/baseLinter.ts	87.5% <0%> (-4.17%)	⬇️
...reter/locators/services/cacheableLocatorService.ts	95.91% <0%> (+4.08%)	⬆️

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