Activate conda environment using path when name is not available

[karthiknadig]

For #3834

• 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
• Unit tests & system/integration tests are added/updated

[codecov-io]

Codecov Report

Merging #8397 into master will increase coverage by 0.09%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master    #8397      +/-   ##
==========================================
+ Coverage   59.37%   59.46%   +0.09%     
==========================================
  Files         509      509              
  Lines       23299    23389      +90     
  Branches     3763     3779      +16     
==========================================
+ Hits        13833    13908      +75     
- Misses       8567     8575       +8     
- Partials      899      906       +7

Impacted Files	Coverage Δ
src/client/interpreter/locators/services/conda.ts	100% <100%> (ø)	⬆️
...lient/interpreter/locators/services/condaHelper.ts	90.62% <66.66%> (-0.56%)	⬇️
...mentActivationProviders/condaActivationProvider.ts	94.23% <84.61%> (+0.11%)	⬆️
src/client/datascience/jupyter/jupyterExecution.ts	50.69% <0%> (-0.35%)	⬇️
...science/jupyter/liveshare/guestJupyterExecution.ts	22.91% <0%> (ø)	⬆️
src/client/datascience/cellFactory.ts	70.51% <0%> (ø)	⬆️
src/client/datascience/common.ts	92.78% <0%> (ø)	⬆️
src/client/datascience/serviceRegistry.ts	0% <0%> (ø)	⬆️
...ascience/jupyter/liveshare/hostJupyterExecution.ts	45.45% <0%> (ø)	⬆️
src/client/datascience/jupyter/jupyterServer.ts	9.45% <0%> (ø)	⬆️
... and 9 more

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