feat: default to ~/Library/Application\ Support/flipt for db sqlite file on mac

[markphelps]

Fixes: FLI-554

• On macOS we default the Sqlite DB to ~/Library/Application\ Support/flipt/flipt.db
• On linux we continue to default to /var/opt/flipt/flipt.db
• Removes unused db.migrations configs

[codecov]

Codecov Report

Merging #2039 (1199397) into main (a92355c) will decrease coverage by 0.02%.
The diff coverage is 82.97%.

@@            Coverage Diff             @@
##             main    #2039      +/-   ##
==========================================
- Coverage   70.60%   70.58%   -0.02%     
==========================================
  Files          71       72       +1     
  Lines        6791     6814      +23     
==========================================
+ Hits         4795     4810      +15     
- Misses       1728     1733       +5     
- Partials      268      271       +3     

Files Changed	Coverage Δ
internal/config/deprecations.go	100.00% <ø> (ø)
internal/config/config.go	86.96% <44.44%> (-1.31%)	⬇️
internal/config/database.go	91.66% <66.66%> (-8.34%)	⬇️
internal/config/audit.go	92.85% <100.00%> (+0.54%)	⬆️
internal/config/authentication.go	72.22% <100.00%> (+0.31%)	⬆️
internal/config/cache.go	100.00% <100.00%> (ø)
internal/config/cors.go	100.00% <100.00%> (ø)
internal/config/database_linux.go	100.00% <100.00%> (ø)
internal/config/log.go	100.00% <100.00%> (ø)
internal/config/meta.go	100.00% <100.00%> (ø)
... and 4 more

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[yquansah]

LGTM!

[GeorgeMac]

Very nice