Forbid types with const generics on configurables

[xunilrj]

Description

This PR is continuation of #7483.

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.
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• I have requested a review from the relevant team or maintainers.

---

Note

Rejects const generics in configurables and reuses a new TypeId::has_const_generics for ABI/configurable checks; updates failing test to cover configurable case.

• Type System:
  • Add TypeId::has_const_generics(engines) to detect const generics across nested types.
• ABI:
  • Replace local const-generic checker with type_id.has_const_generics(engines) in TyAbiDecl::forbid_const_generics.
• Configurables:
  • Add TyConfigurableDecl::forbid_const_generics and enforce it during type checking in TyDecl::type_check.
• Tests:
  • Extend should_fail/unsupported_const_generics with a configurable using const generics and update snapshot to include the new error and shifted line numbers.

^{Written by Cursor Bugbot for commit d6514cb. This will update automatically on new commits. Configure here.}

[codspeed-hq]

CodSpeed Performance Report

Merging #7494 will not alter performance

_{Comparing xunilrj/forbid-const-generics-configurables (d6514cb) with master (fb10b2f)}

Summary

✅ 25 untouched