chore(experiment): remove defaulted bolt and bolt-install experiments

[zimeg]

Changelog

We concluded the bolt and bolt-install experiments with current and ongoing support of app development with the Bolt for JavaScript and Bolt for Python frameworks. This has been a default experience since v3.0.0 but now it's not noted as experimental.

Summary

This PR removes the defaulted bolt and bolt-install experiments as complete with ongoing support 🏁 ✨

Reviewers

Earlier logic to default the create and deploy and app selection branches of these experiments were removed in #141 and #158 and #162 so we might test the following for confidence:

$ slack create asdf  # Select a Bolt for Javascript or Bolt for Python app
$ cd asdf
$ slack run          # Create a new app from the included manifest file
$ rm manifest.json
$ slack run          # Confirm the remote manifest continues to be used
$ slack delete

No change for ROSI apps with the same commands 🥀

Notes

Ongoing iteration is still hoped in possibilities toward Bolt frameworks but I hope removing the experimental branches of install lets us focus to upcoming experiments with a perhaps timebound ⏳

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.07%. Comparing base (c449532) to head (2b70a6c).

Files with missing lines	Patch %	Lines
internal/pkg/apps/install.go	69.23%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   65.06%   65.07%           
=======================================
  Files         215      215           
  Lines       18179    18149   -30     
=======================================
- Hits        11829    11811   -18     
+ Misses       5254     5247    -7     
+ Partials     1096     1091    -5     

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[srtaalej]

big thanks for updating this! yay to cleaner code 🚀 💟