Inherit defaultSettings from the project when the target's defaultSettings is nil

[pepicrft]

Short description 📝

Someone reported that their project targets got build settings even though defaultSettings was set to nil at the target level, and to none at the project level. As @kwridan found out, it happens because the DefaultSettingsProvider defaulted to essential when the target's defaultSettings is nil.

I'm this PR I'm changing that behavior to inherit the defaultSettings from the project that contains the target.

[codecov]

Codecov Report

Merging #1338 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1338   +/-   ##
=======================================
  Coverage   75.17%   75.18%           
=======================================
  Files         316      316           
  Lines       10345    10349    +4     
=======================================
+ Hits         7777     7781    +4     
  Misses       2568     2568           

Impacted Files	Coverage Δ
Sources/TuistGenerator/Dot/DotGraph.swift	100.00% <ø> (ø)
...es/TuistGenerator/Utils/EmbedScriptGenerator.swift	98.75% <ø> (ø)
Sources/TuistCore/Graph/Nodes/FrameworkNode.swift	100.00% <100.00%> (ø)
Sources/TuistCore/Graph/Nodes/LibraryNode.swift	94.44% <100.00%> (ø)
Sources/TuistCore/Graph/Nodes/TargetNode.swift	82.22% <100.00%> (ø)
...ources/TuistCore/Graph/Nodes/XCFrameworkNode.swift	100.00% <100.00%> (ø)
...ces/TuistGenerator/Generator/ConfigGenerator.swift	97.97% <100.00%> (+0.02%)	⬆️
...es/TuistGenerator/Generator/ProjectGenerator.swift	92.41% <100.00%> (+0.05%)	⬆️
...ces/TuistGenerator/Generator/TargetGenerator.swift	100.00% <100.00%> (ø)
...stGenerator/Settings/DefaultSettingsProvider.swift	100.00% <100.00%> (ø)

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[kwridan]

Awesome 🎉