fix(sims): TestAppSimulationAfterImport and legacy proposal handling (backport #21800)

[mergify]

Description

The make test-sim-after-import run was failing after sims2 were merged. This PR includes a fix that takes the startup height into account and ensures that the bech32 addresses for the test accounts are set. For this the accounts from the initial run are forwarded instead of parsing genesis with new (non matching) private keys.

includes #21784

Please note the changes to the x/simulation package that are api breaking. This does not affect module code and should be covered by the original changelog

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Summary by CodeRabbit

• Bug Fixes

  • Improved error handling in simulation functions to prevent abrupt test failures and ensure data integrity.

• New Features

  • Enhanced simulation initialization with the option to set an initial block height.
  • Added account data return in simulation functions for better context and error reporting.

• Refactor

  • Streamlined function signatures and internal logic for clarity and performance, particularly in message factory handling.
  • Restructured message factory management to improve functionality and clarity.

• Tests

  • Expanded test coverage for unique type registries and weighted factory methods, ensuring robust validation of logic.
  • Introduced new tests for weighted factory methods and iterator functionalities.

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This is an automatic backport of pull request #21800 done by [Mergify](https://mergify.com).

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