rust-tests: add test to check if `Cargo.lock` is up-to-date An out-of-date `Cargo.lock` is the source of rebase conflicts, prevents a reproductible build, introduces desync between the series that introduces a change in dependencies and the one that eventually commits the `Cargo.lock`, and is just a general annoyance. This commit demonstrates that the test works, the next one fixes the currently out-of-date `Cargo.lock`. Differential Revision: https://phab.mercurial-scm.org/D9079

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#require cargo test-repo

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  $ . "$TESTDIR/helpers-testrepo.sh"

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  $ cd "$TESTDIR"/../rust

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Check if Cargo.lock is up-to-date. Will fail with a 101 error code if not.

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  $ cargo check --locked --all --quiet

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However most CIs will run `cargo build` or similar before running the tests, so we need to check if it was modified

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  $ testrepohg diff