inherent disputes: remove per block initializer and disputes timeout event (#6937)

* Limit disputes weight and remove initializer code

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* const

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* remove timeout test

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* review feedback #1

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Remove the new weight limiting for disputes

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* cargo lock

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Remove dispute_conclusion_by_time_out_period

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Enable migrations

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Update guide

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Fix comment

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* More guide fixes

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* Also migrate pending configs

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* fix build

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

* fix test

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

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Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>