component: Replace linkme with inventory (#30705)

This PR replaces the use of `linkme` with `inventory` for the component
preview registration.

Release Notes:

- N/A

crates/ui_input/Cargo.toml

@@ -15,7 +15,6 @@ path = "src/ui_input.rs"
 component.workspace = true
 editor.workspace = true
 gpui.workspace = true
-linkme.workspace = true
 settings.workspace = true
 theme.workspace = true
 ui.workspace = true