enable the dbg_macro clippy rule

[DetachHead]

Summary

after @connernilsen pointed out that i accidentally committed a dbg! macro, i wondered if there was a clippy rule to prevent such mistakes (see #4729 (comment)). turns out there is!

note that enabling a rule globally seems to be nowhere near as straightforward as it is in most other linters, so i had to make some other changes:

• i had to set workspace = true in each package (Consider disabling collapsible_if or providing a convenient way to disable collapsible_if globally. rust-lang/rust-clippy#16541 (comment))
• i also had to move the existing unexpected_cfgs config out of the individual packages into the global config, to workaround Packages overriding inherited lints in Cargo.toml + adding lints rust-lang/cargo#13157

Test Plan

intentionally inserted a dbg! macro and ran cargo clippy:

error: the `dbg!` macro is intended as a debugging tool
  --> crates/pyrefly_config/src/migration/error_codes.rs:72:9
   |
72 |         dbg!(&pyright_cfg.type_checking_mode);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.98.0/index.html#dbg_macro
   = note: requested on the command line with `-D clippy::dbg-macro`
help: remove the invocation before committing it to a version control system
   |
72 -         dbg!(&pyright_cfg.type_checking_mode);
72 +         &pyright_cfg.type_checking_mode;
   |

error: could not compile `pyrefly_config` (lib) due to 1 previous error

[meta-codesync]

@stroxler has imported this pull request. If you are a Meta employee, you can view this in D118959745. (Because this pull request was imported automatically, there will not be any future comments.)

[stroxler]

Thanks!

Don't worry about the red internal signal, I had to patch this because cargo config is derived from our internal buck build setup but the change is good. I'll try to get this in soon, merging requires a second review and it's a holiday weekend so I'm not sure how soon

[samwgoldman]

Review automatically exported from Phabricator review in Meta.

[meta-codesync]

@stroxler merged this pull request in 4208c19.