Remove Executed Migrations (#7495)

* Polkadot is at .42

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Kusama is on .43

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Westend is at .43

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Rococo is at .42

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Make UMP limits migration more idempotentish

Already 100% idempotent per design, but not it wont try to schedule
an unneeded upgrade. Note that the case that the new upgrade is
already scheduled is not checked. In that case it will still upgrade
the same thing again, but should be no problem.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Clippy

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Delete old migration code

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fmt

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove old tests

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Polkadot is at .43

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove a ton of shit

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove more

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove unused code

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Rococo is NOT yet at .43, but remove anyway

Rococo is the only runtime that is not yet at .43, but keeping
the migration code just for it is not worth it since devops
can just apply it at any time.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove old test

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: parity-processbot <>