Default python.workspaceSymbols.enabled to false

[Kim-Adeline Miguel (kimadeline)]

For #9046

• 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 (codecov-io)]

Codecov Report

Merging #9056 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9056   +/-   ##
=======================================
  Coverage   57.07%   57.07%           
=======================================
  Files         551      551           
  Lines       29075    29075           
  Branches     4392     4392           
=======================================
  Hits        16596    16596           
  Misses      11573    11573           
  Partials      906      906

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