Remove unused `infos`, `http-ui`, and `milli/fuzz`, crates

[loiclec]

We haven't used the infos/, http-ui/ and milli/fuzz/ crates in a long time. They are not properly maintained and probably do not work correctly anymore.

This PR removes these crates entirely from the workspace to reduce the amount of code we need to maintain.

[curquiza]

Bye bye pretty crates 🦀

[bors[bot]]

Build succeeded:

• Run Rustfmt
• Tests on macos-latest
• Tests on ubuntu-20.04
• Tests on windows-latest