Remove `everybody_loops`?

[camelid]

Based on a quick ripgrep, everybody_loops seems to only be used for the -Z unpretty=everybody_loops CLI option. (#73566 removed rustdoc's use of everybody_loops.)

Does anyone use -Z unpretty=everybody_loops? If not, I think we should remove the pass.

cc #82617
cc @jyn514

[camelid]

Not sure if this requires an MCP, but thought I'd start with an issue.

[camelid]

It looks like this has been discussed before: #73566 (comment)

If we can't remove it because people still use it, maybe it's worth adding documentation to #82617 saying that it's only there for the flag and you shouldn't use it in compiler/rustdoc/etc code?

[jyn514]

Closing this since at least @pnkfelix still uses the option.