Use VSC API instead of hardcoding the uri resource vscode-resource

[DonJayamanne]

For #7834

Depends on PR (#7833) to update the package.json

• 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
• [n/a] Has sufficient logging.
• [n/a] Has telemetry for enhancements.
• [n/a] Unit tests & system/integration tests are added/updated
• [n/a] Test plan is updated as appropriate
• [n/a] package-lock.json has been regenerated by running npm install (if dependencies have changed)
• [n/a] The wiki is updated with any design decisions/details.

[codecov-io]

Codecov Report

Merging #7835 into master will decrease coverage by 0.67%.
The diff coverage is 25%.

@@            Coverage Diff             @@
##           master    #7835      +/-   ##
==========================================
- Coverage   59.25%   58.57%   -0.68%     
==========================================
  Files         498      498              
  Lines       22295    21932     -363     
  Branches     3580     3575       -5     
==========================================
- Hits        13210    12847     -363     
  Misses       8263     8263              
  Partials      822      822

Impacted Files	Coverage Δ
src/client/common/application/webPanel.ts	18.18% <25%> (+0.79%)	⬆️
...nt/datascience/jupyter/invalidNotebookFileError.ts	0% <0%> (-75%)	⬇️
.../client/datascience/jupyter/jupyterConnectError.ts	0% <0%> (-66.67%)	⬇️
...science/jupyter/jupyterKernelPromiseFailedError.ts	0% <0%> (-50%)	⬇️
...ent/datascience/jupyter/jupyterWaitForIdleError.ts	0% <0%> (-50%)	⬇️
src/client/language/characters.ts	12% <0%> (-21.34%)	⬇️
src/client/testing/codeLenses/main.ts	60% <0%> (-17.78%)	⬇️
src/client/datascience/cellFactory.ts	72.34% <0%> (-17.32%)	⬇️
src/client/constants.ts	75% <0%> (-5%)	⬇️
src/client/providers/providerUtilities.ts	84.61% <0%> (-4.28%)	⬇️
... and 26 more

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