Rust: add more macro expansion tests

[redsun82]

This highlights 4 classes of macro calls that don't get any expansion from rust-analyzer 0.0.274 onwards (they do on current main).

[Copilot]

Pull Request Overview

This PR expands the macro-expansion integration tests in QL by adding new predicates and updating expected outputs to catch previously untested macro cases.

• Added three new QL predicates for attribute macro expansions, resolved macro calls, and unexpanded macro calls.
• Updated expected results to include attribute/crate-specific paths and counts.
• Restructured the workspace (renamed the macros crate, added attributes, calls, proc_macros) and updated source archive and diagnostics expectations.

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
rust/ql/integration-tests/macro-expansion/test.ql	Added predicates attribute_macros, macro_calls, and unexpanded_macro_calls.
rust/ql/integration-tests/macro-expansion/test.expected	Updated expected test sections and paths.
rust/ql/integration-tests/macro-expansion/summary.qlref	Removed obsolete summary reference.
rust/ql/integration-tests/macro-expansion/summary.expected	Cleared old summary expectations.
rust/ql/integration-tests/macro-expansion/source_archive.expected	Added new source files under attributes and calls.
rust/ql/integration-tests/macro-expansion/proc_macros/Cargo.toml	Renamed crate from macros to proc_macros.
rust/ql/integration-tests/macro-expansion/calls/src/lib.rs	Added several macro calls to test expansion.
rust/ql/integration-tests/macro-expansion/attributes/src/lib.rs	Switched to proc_macros::repeat and inline concat! test.
rust/ql/integration-tests/macro-expansion/Cargo.toml	Updated workspace members.
rust/ql/integration-tests/.gitignore	Added Cargo.lock to ignore.

Comments suppressed due to low confidence (1)

rust/ql/integration-tests/macro-expansion/test.ql:7

• [nitpick] The predicate name macro_calls is very generic. Consider renaming it to resolved_macro_calls to clearly distinguish it from unexpanded_macro_calls.

query predicate macro_calls(MacroCall c, AstNode expansion) {

[redsun82]

I've used this to raise an issue to rust-analyzer: rust-lang/rust-analyzer#19873

[geoffw0]

LGTM