Rust: make MacroStmts expressions

[aibaars]

This pull request adds a dataflow step for the expression of a MacroStmts block. MacroStmts nodes are inserted when a macro is expanded inside a block: for example:

    let unsafe_query_4 = if remote_string == "*" {
        "SELECT * FROM people".to_string()
    } else {
        format!("SELECT * FROM people WHERE firstname='{remote_string}'")
    };

This pull request changes the control and data flow of MacroStmts to match that of ExprBlock.

Thanks to @coadaflorin for spotting this case.

[Copilot]

Pull Request Overview

This pull request refactors the handling of MacroStmts by updating its annotation to inherit dataflow behavior from ExprBlock and adjusts related test queries accordingly.

• Updated the MacroStmts annotation to include replace_bases and cfg parameters.
• Modified the formatting of the doc string in annotations.py.
• Revised the unsafe_query_4 definition in the MySQL test to use a conditional expression for query generation.

Reviewed Changes

Copilot reviewed 13 out of 25 changed files in this pull request and generated no comments.

File	Description
rust/schema/annotations.py	Updated MacroStmts annotation and adjusted doc string formatting.
rust/ql/test/query-tests/security/CWE-089/sqlx.rs	Revised unsafe_query_4 to conditionally generate the query.

Files not reviewed (12)

• rust/downgrades/48a13c5eec3663c32ae89bb0aad8a03f52ad68c3/upgrade.properties: Language not supported
• rust/ql/.generated.list: Language not supported
• rust/ql/lib/codeql/rust/controlflow/internal/ControlFlowGraphImpl.qll: Language not supported
• rust/ql/lib/codeql/rust/dataflow/internal/DataFlowImpl.qll: Language not supported
• rust/ql/lib/codeql/rust/elements/MacroStmts.qll: Language not supported
• rust/ql/lib/rust.dbscheme: Language not supported
• rust/ql/lib/upgrades/e8707b675dc574aca9863eabcc09ac76f15bb9c2/upgrade.properties: Language not supported
• rust/ql/test/library-tests/controlflow/BasicBlocks.expected: Language not supported
• rust/ql/test/library-tests/controlflow/Cfg.expected: Language not supported
• rust/ql/test/library-tests/dataflow/local/DataFlowStep.expected: Language not supported
• rust/ql/test/library-tests/variables/Cfg.expected: Language not supported
• rust/ql/test/query-tests/security/CWE-089/SqlInjection.expected: Language not supported