[Epic]: Remove baseapp and v1 from main

[julienrbrt]

Summary

With Cosmos SDK v2, v0.52 was the last version having baseapp support. This means baseapp, and its depend can be removed from main.

Problem Definition

BaseApp is being imported everywhere. Additionally some tests are still depending on baseapp of some other deprecated parts.
This should first be fixed before removing baseapp.

Work Breakdown

All removal of code needs 1. to be completed to ensure no regressions has been introduced in v2.
When removing components, do not forget to remove anything related to it (think of CI jobs f.e)

• Blocker: Complete integration/v2 migration (server/v2: integration tests  #20799)
• Removal of testutil/integration (@sontrinh16)
• Removal of simapp (without v2 obv) (ref chore: remove simapp v1 #23009)
  • cd simapp; rm -r $(ls -A | grep -v v2) # + remove from CI build, simapp entry in go.work.example, remove system tests v1 job, COSMOS_BUILD_OPTIONS=v2 as default in makefile
• Removal of runtime (without v2 obv) & baseapp option
• Removal of testutil/sims (maybe)
• Removal of server and commands under client (without v2 obv) (ref: refactor: remove v1 commands and begin server removal #23018, chore: remove snapshot commands #23015)
• Removal of baseapp imports in modules (Investigate how to remove baseapp from module tests. #22903)
• Removal of sdk.Context
• Removal of the module manager and its types

The client package should stay for the time being and isn't part of this epic.