Fallback functionality for interpreter discovery

[gaborbernat]

👍

[codecov]

Codecov Report

Merging #1995 into main will decrease coverage by 2.89%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1995      +/-   ##
==========================================
- Coverage   94.12%   91.22%   -2.90%     
==========================================
  Files          86       86              
  Lines        4269     4274       +5     
==========================================
- Hits         4018     3899     -119     
- Misses        251      375     +124     

Flag	Coverage Δ
#tests	91.22% <100.00%> (-2.90%)	⬇️

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Impacted Files	Coverage Δ
src/virtualenv/discovery/builtin.py	85.21% <100.00%> (+0.67%)	⬆️
...nv/create/via_global_ref/builtin/cpython/mac_os.py	24.30% <0.00%> (-59.67%)	⬇️
...nv/create/via_global_ref/builtin/cpython/common.py	93.02% <0.00%> (-6.98%)	⬇️
...ualenv/create/via_global_ref/builtin/pypy/pypy2.py	92.20% <0.00%> (-6.50%)	⬇️
...ualenv/create/via_global_ref/builtin/pypy/pypy3.py	94.87% <0.00%> (-5.13%)	⬇️
src/virtualenv/info.py	95.00% <0.00%> (-5.00%)	⬇️
src/virtualenv/util/path/_pathlib/via_os_path.py	89.62% <0.00%> (-1.89%)	⬇️
...rc/virtualenv/create/via_global_ref/builtin/ref.py	91.26% <0.00%> (-1.59%)	⬇️

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