ci: split cargo-clippy into stable and nightly

[yihau]

Problem

context: https://discord.com/channels/428295358100013066/560503042458517505/1187442157326450780

Summary of Changes

• split cargo-clippy into stable and nightly

btw, if we still feel this one too slow, I can split them into smaller pieces (but will be a little bit hardcoded)
or we need a better macos runner 😢

[CriesofCarrots]

The split code looks fine. Should probably put the mergify changes in here too, though, since you're changing the job names.

[yihau]

okay! updated! just had a quick look to those code. I guess they can be backported directly 🤞

[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.