disputes pallet: Remove spam slots (#6345)

* disputes pallet: Filter disputes with votes less than supermajority threshold

* Remove `max_spam_slots` usages

* Remove `SpamSlots`

* Remove `SpamSlotChange`

* Remove `Error<T>::PotentialSpam` and stale comments

* `create_disputes_with_no_spam` -> `create_disputes`

* Make tests compile - wip commit

* Rework `test_dispute_timeout`. Rename `update_spam_slots` to `filter_dispute_set`

* Remove `dispute_statement_becoming_onesided_due_to_spamslots_is_accepted` and `filter_correctly_accounts_spam_slots` -> they bring no value with removed spam slots

* Fix `test_provide_multi_dispute_success_and_other`

* Remove an old comment

* Remove spam slots from tests - clean todo comments

* Remove test - `test_decrement_spam`

* todo comments

* Update TODO comments

* Extract `test_unconfirmed_are_ignored` as separate test case

* Remove dead code

* Fix `test_unconfirmed_are_ignored`

* Remove dead code in `filter_dispute_data`

* Fix weights (related to commit "Remove `SpamSlots`")

* Disputes migration - first try

* Remove `dispute_max_spam_slots` + storage migration

* Fix `HostConfig` migration tests

* Deprecate `SpamSlots`

* Code review feedback

* add weight for storage version update
* fix bound for clear()

* Fix weights in disputes migration

* Revert "Deprecate `SpamSlots`"

This reverts commit 8c4d967c7b061abd76ba8b551223918c0b9e6370.

* Make mod migration public

* Remove `SpamSlots` from disputes pallet and use `storage_alias` in the migration

* Fix call to `clear()` for `SpamSlots` in migration

* Update migration and add a `try-runtime` test

* Add `pre_upgrade` `try-runtime` test

* Fix some test names in `HostConfiguration` migration

* Link spamslots migration in all runtimes

* Add `test_unconfirmed_disputes_cause_block_import_error`

* Update guide

- Remove `SpamSlots` related information from roadmap/implementers-guide/src/runtime/disputes.md
- Add 'Disputes filtering' to Runtime section of the Implementor's guide

* Update runtime/parachains/src/configuration/migration.rs

Co-authored-by: Marcin S. <[email protected]>

* Code review feedback - update logs

* Code review feedback: fix weights

* Update runtime/parachains/src/disputes.rs

Co-authored-by: s0me0ne-unkn0wn <[email protected]>

* Additional logs in disputes migration

* Fix merge conflicts

* Add version checks in try-runtime tests

* Fix a compilation warning`

Co-authored-by: Marcin S. <[email protected]>
Co-authored-by: s0me0ne-unkn0wn <[email protected]>