revert: Revert RunMigrationBeginBlock addition in v0.50

[julienrbrt]

Description

Partially reverts 6a5adc4
Reverts 3a96bb9
Reverts 27f5db2

cc @mmsqe

Last blocker before v0.50 rc release.

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[mmsqe]

Thanks for the cleanup, not sure if we still keep this in doc

cosmos-sdk/docs/docs/building-modules/01-module-manager.md

Line 44 in 51b607c

* [`appmodule.UpgradeModule`]: The extension interface that signify if the `AppModule` if the module is an upgrade module.

[julienrbrt]

Thanks for the cleanup, not sure if we still keep this in doc

cosmos-sdk/docs/docs/building-modules/01-module-manager.md

Line 44 in 51b607c

* [`appmodule.UpgradeModule`]: The extension interface that signify if the `AppModule` if the module is an upgrade module.

Good catch!