Idiomatic Salsa Tracking Issue

[Veykril]

This is an issue to track the progress of replacing the unidiomatic usages of old salsa with the new one once #18964 lands

• base-db
• cfg
• hir
• hir-def
• hir-expand
• hir-ty
• ide
• ide-assists
• ide-completion
• ide-db
• ide-diagnostics
• ide-ssr
• intern
• limit
• load-cargo
• mbe
• parser
• paths
• proc-macro-api
• proc-macro-srv
• proc-macro-srv-cli
• profile
• project-model
• ra-salsa
• span
• stdx
• syntax
• syntax-bridge
• test-fixture
• test-utils
• toolchain
• tt
• vfs-notify
• vfs
• edition

Most of these won't have any relevant things in them and can be crossed of immediately