Update Tuist to 4.202.5 and use essential build settings

[Kyle-Ye]

Summary

• Update the pinned Tuist version to 4.202.5 and enable its SwiftPM-based dependency handling.
• Use .essential default settings for the generated Example project and package targets.
• Remove explicit DEBUG definitions that are already provided by the essential Debug settings.
• Refresh the package source locations emitted by the updated dependency resolver.

Motivation

The Example manifests previously used .none, which prevented Tuist's essential target settings from being emitted. As a result, macro targets could attempt to build for a non-host architecture and fail when consuming host-only prebuilt SwiftSyntax modules on Apple Silicon.

Using .essential allows Tuist to emit the required baseline settings consistently across the generated project and package targets. The existing OPENSWIFTUI compilation conditions remain explicitly configured, while DEBUG is supplied by the essential Debug settings.

Validation

• Regenerated the Example workspace successfully while validating the manifest changes.
• Built OSUI_Example with the OpenSwiftUIDebug configuration for macOS arm64.
• Confirmed that the macro executables build for the active host architecture.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates the Example’s Tuist setup to rely on Tuist’s essential default build settings and a newer pinned Tuist version.

Changes:

• Bumps the pinned Tuist version to 4.202.5 and enables SwiftPM-based dependency handling via TUIST_USE_SWIFTERPM=1.
• Switches generated project and package settings from .none to .essential to ensure baseline build settings are emitted consistently.
• Removes explicit DEBUG compilation definitions from debug settings, relying on essential Debug settings instead.
• Ensures the OpenSwiftUI package target receives explicit essential/default configuration settings.
• Refreshes Example/Tuist/Package.resolved source locations as produced by the updated resolver.

Technical Notes: The key intent is to avoid macro targets building for a non-host architecture (notably on Apple Silicon) by guaranteeing essential baseline settings are applied across generated targets.

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[augmentcode]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.93%. Comparing base (1c8d846) to head (7bfd7b0).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #939       +/-   ##
===========================================
+ Coverage   13.77%   25.93%   +12.16%     
===========================================
  Files         678      721       +43     
  Lines       44436    50700     +6264     
===========================================
+ Hits         6119    13150     +7031     
+ Misses      38317    37550      -767     

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