Rust: exclude extraction of code excluded by cfg

[redsun82]

This change skips all extraction of disabled #[cfg] blocks. This:

• brings down warnings coming from those blocks
• avoids spurious alerts coming from them
• might also save some execution time and database size

This requires a newer version of rust-analyzer than what we have on main, reason for which this sits on top of #18295 and should be merged after that.

[Copilot]

Copilot reviewed 3 out of 6 changed files in this pull request and generated 1 comment.

Files not reviewed (3)

• rust/ql/integration-tests/options/cfg/functions.ql: Language not supported
• rust/ql/integration-tests/options/features/functions.ql: Language not supported
• rust/ql/integration-tests/options/target/functions.ql: Language not supported

Comments suppressed due to low confidence (1)

rust/ast-generator/src/main.rs:527

• [nitpick] The variable name 'field' is too generic. Consider renaming it to 'node_field' for better clarity.

if field.name == "attrs" {

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[paldepind]

Perhaps this would be nicer with any and is_some_and?

Suggested change

	for attr in item.attrs() {
	if let Some((name, tokens)) = attr.as_simple_call() {
	if name == "cfg" && sema.check_cfg_attr(&tokens) == Some(false) {
	return true;
	}
	}
	}
	false
	item.attrs().any(|attr| {
	attr.as_simple_call().is_some_and(|(name, tokens)| {
	name == "cfg" && sema.check_cfg_attr(&tokens) == Some(false)
	})
	})