Enable name-resolution-after-monomorphization again

[xunilrj]

Description

This test was disabled when enabling encoding V1 because I had to include core on this project. That made the method neq ambiguous. And the compiler was correctly pointing this out.

There is no bug here, the only solution is to rename this method (what I did). I also left the trait with the same name to make the resolution more complex.

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).
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• 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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