fix migrations (also companion for #14421) (#7454)

* fix migrations

* use society versioned runtime upgrade

* simplify usage of versionedruntimeupgrade

* use society experimental feature

* improve usage of experimental flag

* doc comment

* Merge branch 'master' of github.com:paritytech/polkadot into liam-fix-migrations

* Revert "Merge branch 'master' of github.com:paritytech/polkadot into liam-fix-migrations"

This reverts commit 41ab0621811ead11b0a7f91338b0895208feef77.

* doc comment

* westend experimental feature

* Revert "westend experimental feature"

This reverts commit 42f4f1b76655ef509a92c324d18d635a1b913dcb.

* feature gate experimental xcm migration

* update lockfile for {"substrate"}

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Co-authored-by: parity-processbot <>