Print a warning in case of non-empty badBlocks

[tomaka]

cc #2584

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

---

 Delta Bytes │ Item
─────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────
        +296 ┊ <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::h8caa37c7c5194025
        +177 ┊ <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hc40185d675a53667
        +150 ┊ <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::haa97fd3e2e33721d
        +144 ┊ data[0]
         +79 ┊ hashbrown::set::HashSet<T,S,A>::iter::hc044ba2effe9a923
         +56 ┊ <hashbrown::set::Iter<K> as core::iter::traits::iterator::Iterator>::next::hb0d0519b29d515cc
         +55 ┊ smoldot::chain_spec::ChainSpec::bad_blocks_hashes::hee3249a7b03e4147
         +34 ┊ <hashbrown::map::Iter<K,V> as core::iter::traits::iterator::Iterator>::next::hbc15373e07cb1d9d
         +33 ┊ core::iter::traits::iterator::Iterator::fold::h2fe0c6ed237b0b6e
       +1763 ┊ Σ [9 Total Rows]