osquery: remove

[flokli]

osquery was marked as broken since April.

If somebody steps up to fix it, we can always revive it from the
histroy, but there's not much value in shipping completely broken things
in current master.

cc @Ma27

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[infinisil]

Ping @Ma27 who indicated in #58834 (comment) to look into fixing the build (Edit: Oh you already pinged them, duh)

[Ma27]

I don't use osquery anymore. I tried to look into this several times, but the build system is pretty complex (also due to our cmake-related patches for osquery).

I don't have the time and motivation atm to fix this, so if noone else steps up, I'd be fine with removing it.

[flokli]

So let's remove it. If somebody wants to get it going before the next release, we can add it back and remove it from the changelog.