Rust: backport Cargo.lock fixes for CI

[redsun82]

No description provided.

[Copilot]

Pull Request Overview

This PR backports fixes to preserve and track Cargo.lock in CI, updating related tests and cleanup logic.

• Update expected crate graph outputs to match the bumped cfg_if version in the lock file.
• Stop ignoring Cargo.lock in the test .gitignore so the lock file is tracked.
• Remove the logic that deleted Cargo.lock during test setup in qltest.rs.

Reviewed Changes

Copilot reviewed 3 out of 43 changed files in this pull request and generated no comments.

File	Description
rust/ql/test/extractor-tests/crate_graph/crates.expected	Bumped cfg_if version from 1.0.0 to 1.0.1 in expected output.
rust/ql/test/.gitignore	Removed Cargo.lock from ignore list to track the lock file.
rust/extractor/src/qltest.rs	Removed remove_file_if_exists helper and its invocation to stop deleting Cargo.lock.

Comments suppressed due to low confidence (2)

rust/ql/test/.gitignore:2

• [nitpick] Add a comment above this block explaining that Cargo.lock is intentionally tracked now for CI reproducibility.

lib.rs

rust/extractor/src/qltest.rs:62

• [nitpick] Consider adding a comment here to note why we no longer remove Cargo.lock (to preserve the lock file for reproducible CI builds).

pub(crate) fn prepare(config: &mut Config) -> anyhow::Result<()> {

[navntoft]

👍 assuming these commits are cherry-picked from the PRs that fixed CI on main.

[redsun82]

👍 assuming these commits are cherry-picked from the PRs that fixed CI on main.

we will see once CI passes here