Follow up to https://github.com/denoland/deno/pull/30029.
Definition of signal numbers/names were moved from `ext/os` to
`ext/signals`.
All occurrences of `tokio::signal` API were replaced with helpers from
`deno_signals` helpers. Additionally clippy lints were added to ensure `tokio::signal`
is not used by accident.
Closes https://github.com/denoland/deno/issues/30223
Co-authored-by: snek <the@snek.dev>
Set up a new centralized signal handling path, which emulates the
default unless something is explicitly registered to prevent it.
Fixes: https://github.com/denoland/deno/issues/29590
---------
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>
