Cherry pick conda and mypy into release-2019.12

[kimadeline]

• 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

❗ No coverage uploaded for pull request base (release-2019.12@ff4f124). Click here to learn what that means.
The diff coverage is 43.18%.

@@                Coverage Diff                 @@
##             release-2019.12    #9530   +/-   ##
==================================================
  Coverage                   ?   57.25%           
==================================================
  Files                      ?      551           
  Lines                      ?    29425           
  Branches                   ?     4475           
==================================================
  Hits                       ?    16846           
  Misses                     ?    11632           
  Partials                   ?      947

Impacted Files	Coverage Δ
...client/datascience/jupyter/jupyterCommandFinder.ts	71.22% <ø> (ø)
...rc/client/common/application/webPanels/webPanel.ts	15.87% <ø> (ø)
src/client/common/process/types.ts	100% <ø> (ø)
src/client/datascience/constants.ts	99.68% <100%> (ø)
src/client/datascience/jupyter/notebookStarter.ts	71.54% <100%> (ø)
src/client/terminals/codeExecution/repl.ts	100% <100%> (ø)
...t/terminals/codeExecution/terminalCodeExecution.ts	100% <100%> (ø)
...rc/client/common/process/pythonExecutionFactory.ts	96.29% <100%> (ø)
...erminals/codeExecution/djangoShellCodeExecution.ts	100% <100%> (ø)
...lient/datascience/jupyter/kernels/kernelService.ts	56.08% <24%> (ø)
... and 2 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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