Don't call acquireVsCodeApi more than once

[joyceerhl]

For https://github.com/microsoft/vscode-python/issues/14535

• 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 #14543 into release-2020.10 will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           release-2020.10   #14543   +/-   ##
================================================
  Coverage            59.19%   59.19%           
================================================
  Files                  721      721           
  Lines                40230    40230           
  Branches              5828     5828           
================================================
  Hits                 23813    23813           
  Misses               15155    15155           
  Partials              1262     1262           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication