Enable commented tests for references and enums in match expressions

[ironcev]

Description

This PR enables temporarily commented tests:

• related to references that were commented out because of the bug described in MCPI memory ownership issue with mutable zero-sized arrays in release builds #5692.
• related to enums in match expressions that were commented out because of type inference issues that were fixed in Fix type check and inference issues in references, structs, and enums #5643.

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).
• 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.