Refactor pipelines into stages

[DonJayamanne]

Refactor pipelines into stages, in preparation for the UI Tests.
Broke UI Tests PR into multiple. First PR would be to refactor the pipeline into stages (without any UI Test specific changes).

Created PR upon @rchiodo @IanMatthewHuff request when the UI Tests PR (#6717) was reviewed.

Benefits of refactor:

• Single template file with global variables (python, node, npm versions, etc). All in one place.
• Template file to initialze jobs (install python, node)
• Template file to compile, build, etc
• I.e. more moduralized for easier maintenance with benefit of reuse of templates.
• Easily visible what stage fails, build, test or reporting phase.
  • Tomorrow linting, checking format of files etc can be added into the build stage.

See below:

Detailed view:

[codecov-io]

Codecov Report

Merging #7430 into master will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7430      +/-   ##
==========================================
+ Coverage   58.22%   58.56%   +0.34%     
==========================================
  Files         492      494       +2     
  Lines       21747    21783      +36     
  Branches     3481     3489       +8     
==========================================
+ Hits        12662    12758      +96     
+ Misses       8298     8236      -62     
- Partials      787      789       +2

Impacted Files	Coverage Δ
src/client/common/crypto.ts	73.33% <0%> (-8.49%)	⬇️
...rc/client/common/process/pythonExecutionFactory.ts	91.66% <0%> (-5.11%)	⬇️
src/client/interpreter/helpers.ts	44.77% <0%> (-1.38%)	⬇️
...reter/locators/services/windowsStoreInterpreter.ts	100% <0%> (ø)	⬆️
src/client/interpreter/serviceRegistry.ts	100% <0%> (ø)	⬆️
src/client/interpreter/locators/types.ts	100% <0%> (ø)	⬆️
...client/common/process/windowsStorePythonProcess.ts	40% <0%> (ø)
...interpreter/locators/services/interpreterFilter.ts	60% <0%> (ø)
src/client/common/experiments.ts	97.19% <0%> (+0.08%)	⬆️
...client/activation/languageServer/languageServer.ts	92.06% <0%> (+0.53%)	⬆️
... and 12 more

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[rchiodo]

[IanMatthewHuff]

🕐

[IanMatthewHuff]