Implemented prompt for survey using A/B test framework

[karrtikr]

For #6957

• 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 #7090 into master will increase coverage by 0.71%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #7090      +/-   ##
==========================================
+ Coverage   57.67%   58.39%   +0.71%     
==========================================
  Files         483      483              
  Lines       21025    21414     +389     
  Branches     3446     3465      +19     
==========================================
+ Hits        12127    12504     +377     
- Misses       8124     8141      +17     
+ Partials      774      769       -5

Impacted Files	Coverage Δ
src/client/activation/extensionSurvey.ts	98.11% <100%> (+0.19%)	⬆️
src/client/common/experimentGroups.ts	100% <100%> (ø)	⬆️
src/client/common/logger.ts	68.55% <0%> (-4.41%)	⬇️
src/client/linters/baseLinter.ts	80.34% <0%> (-1.37%)	⬇️
...t/datascience/jupyter/jupyterDataRateLimitError.ts	100% <0%> (ø)	⬆️
src/client/formatters/serviceRegistry.ts	100% <0%> (ø)	⬆️
...lient/datascience/jupyter/jupyterSelfCertsError.ts	100% <0%> (ø)	⬆️
src/client/debugger/extension/serviceRegistry.ts	100% <0%> (ø)	⬆️
src/client/common/variables/serviceRegistry.ts	100% <0%> (ø)	⬆️
src/client/common/process/serviceRegistry.ts	100% <0%> (ø)	⬆️
... and 27 more

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[ericsnowcurrently]

LGTM