Remove obsolete AnyAttribute compiler workaround

[Kyle-Ye]

Summary

• Remove the AnyAttribute compiler workaround and its build configuration
• Use the native OpenAttributeGraph implementation on Linux
• Restore the normal attribute flags, weak attribute, and rasterization paths

See details here.

Testing

• swift build using Swift 6.2.4 on Ubuntu Jammy

Close #39

[augmentcode]

🤖 Augment PR Summary

Summary: This PR removes the now-obsolete AnyAttribute compiler workaround (introduced for #39) and switches back to the normal AttributeGraph integration paths, including on Linux.

Changes:

• Dropped the ANY_ATTRIBUTE_FIX environment toggle and the OPENSWIFTUI_ANY_ATTRIBUTE_FIX build define from Package.swift.
• Deleted the workaround implementations in Sources/OpenSwiftUI/Util/AnyAttributeFix.swift and Sources/OpenSwiftUICore/Util/AnyAttributeFix.swift.
• Removed platform-conditional importing in View_Indirect.swift, relying on the standard package import OpenAttributeGraphShims path.
• Restored normal AttributeGraph flag/weak-attribute behavior in AttributeGraphAdditions.swift (no more unimplemented Linux path).
• Simplified rasterization color mode / color space resolution by removing the workaround-specific branches in RasterizationOptions.swift.

Technical Notes: The change assumes the underlying compiler/toolchain no longer needs the #39 workaround and that Linux can use the native OpenAttributeGraph behavior; PR notes confirm a successful swift build on Ubuntu with Swift 6.2.4.

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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 (95a6131) to head (99b2401).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #938       +/-   ##
===========================================
+ Coverage   13.74%   25.93%   +12.18%     
===========================================
  Files         680      721       +41     
  Lines       44590    50700     +6110     
===========================================
+ Hits         6131    13151     +7020     
+ Misses      38459    37549      -910     

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