Drop x86_64 emulation for CodeQL on arm64 Linux in favour of upcoming native support

[kwvg]

Description

Unlike on macOS, CodeQL did not offer arm64 binaries for Linux. As the CodeQL engine is closed source, recompilation was never an option. To allow CodeQL to run at all (albeit at severely degraded performance), emulation was instead done through QEMU. There appears to be a commitment from GitHub to release arm64 binaries in CodeQL 2.27.0 (see comment)

Tasks

• Drop suppression introduced in 404dee1
• Upgrade query (packs) and libraries to latest CodeQL (as of this writing 2.26.4, source).
• Drop emulation machinery and use upstream CodeQL as published on nixpkgs nightly (source) (and upgrade query packs and libraries if needed)

Related

• sdk%feat(nix): add Nix-based devshells (and Docker wrapped counterparts), cross-compilation for Linux, Windows and macOS, x86_64 emulation for CodeQL on arm64 Linux #35