feat!: make native the default backend

[jpnurmi]

Caution

Breaking / Important behavior change
Linux, macOS, and Windows builds now default to the native backend.

Ref: #2044

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.47%. Comparing base (d51c04f) to head (688f484).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2186      +/-   ##
==========================================
- Coverage   75.52%   75.47%   -0.06%     
==========================================
  Files         103      103              
  Lines       28089    28089              
  Branches     5150     5150              
==========================================
- Hits        21214    21199      -15     
- Misses       5528     5540      +12     
- Partials     1347     1350       +3     

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