Fixes qualified call path without as trait.

[esdrubal]

Description

The parser no longer parses qualified call paths without the as token and trait.

This invalidates code that was previously accepted such as: let x: <u8>::S::<u8> = S::<u8>{x: 8};

Fixes #6389

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[codspeed-hq]

CodSpeed Performance Report

Merging #6764 will degrade performances by 70.88%

_{Comparing esdrubal/6389 (d3322b2) with master (33d3674)}

Summary

❌ 1 regressions
✅ 21 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	master	esdrubal/6389	Change
❌	document_symbol	5.5 ms	18.9 ms	-70.88%