tokio/interval: Fix overflow for interval tick

[lexnv]

This PR fixes an overflow produced by the Instant::poll_tick function when called for an instant set with a period from u64::MAX.

For example, timers initiated like the following would panic because there's no room to add the 5 ms duration:

let mut timer = tokio::time::interval(std::time::Duration::from_secs(u64::MAX));

cc paritytech/polkadot-sdk#7793

[Darksonn]

Thanks for the PR. Please add a test that would have caught this.

[lexnv]

Thanks for the swift review! 🙏

I've added a test and patched the missed tick behavior as well

[Darksonn]

Why can't this test use start_paused?

[lexnv]

We need a bit of delay between two subsequent poll_tick calls (5ms) to enter the misstick behavior and trigger the overflow panic

[Darksonn]

In general, a test that takes 2 seconds to complete is not acceptable. I'm quite certain that the test works just fine with start_paused - the parameter should not change the behavior of tests that rely on time other than making them run faster.