Opt insiders users into beta language server by default

[karrtikr]

For #7108

• 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 #7174 into master will decrease coverage by 0.01%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##           master    #7174      +/-   ##
==========================================
- Coverage    58.5%   58.48%   -0.02%     
==========================================
  Files         485      485              
  Lines       21446    21448       +2     
  Branches     3462     3463       +1     
==========================================
- Hits        12546    12543       -3     
- Misses       8122     8129       +7     
+ Partials      778      776       -2

Impacted Files	Coverage Δ
...ion/languageServer/languageServerPackageService.ts	92.59% <92.59%> (+11.82%)	⬆️
src/client/common/logger.ts	68.55% <0%> (-6.92%)	⬇️

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[kimadeline]

One comment, other than that looks good 👍