Rust: Add tests for Self constructors

[paldepind]

Adds some additional path resolution tests for paths that involve Self. These all work but we don't have any tests covering these cases.

[Copilot]

Pull request overview

This pull request adds test coverage for path resolution involving Self constructors in Rust. The tests verify that Self correctly resolves to the appropriate type (tuple structs, regular structs, and enum variants) in various contexts.

Changes:

• Added new test module self_constructors with tests for Self constructor resolution in tuple structs, regular structs, and enums
• Updated expected test outputs to account for the new tests and line number shifts

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
rust/ql/test/library-tests/type-inference/main.rs	Added a small test for Self constructor in a tuple struct implementing the Default trait
rust/ql/test/library-tests/type-inference/CONSISTENCY/PathResolutionConsistency.expected	Updated line numbers due to code additions (shifted by 11 lines)
rust/ql/test/library-tests/path-resolution/main.rs	Added comprehensive self_constructors module testing Self resolution in tuple structs, regular structs, and enum patterns
rust/ql/test/library-tests/path-resolution/path-resolution.expected	Added expected path resolution entries for the new test cases, including line number updates for existing tests

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