test: fix failing tests after protocompat changes (backport #22889)

[mergify]

Description

Follow-up of #22866

Fixes:

https://github.com/cosmos/cosmos-sdk/actions/runs/12337602773/job/34431523563?pr=22864 https://github.com/cosmos/cosmos-sdk/actions/runs/12344400459/job/34447459757?pr=22873

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Summary by CodeRabbit

• New Features

  • Introduced a new BankKeeper interface for enhanced testing capabilities.

• Bug Fixes

  • Improved error handling in hybrid handler functions for pointer manipulation.
  • Enhanced test suite for group keeper module to cover edge cases and error conditions.

• Documentation

  • Updated method signatures in test files to reflect new expectations and functionality.

• Chores

  • Removed obsolete mock implementation file to streamline testing utilities.

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This is an automatic backport of pull request #22889 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of cfe1940 has failed:

On branch mergify/bp/release/v0.52.x/pr-22889
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit cfe194013.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   baseapp/internal/protocompat/protocompat.go
	modified:   scripts/mockgen.sh
	modified:   x/authz/keeper/keeper_test.go
	deleted:    x/authz/testutil/bank_helpers.go
	new file:   x/authz/testutil/expected_keepers.go
	modified:   x/group/keeper/msg_server_test.go
	modified:   x/group/testutil/expected_keepers.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/authz/testutil/expected_keepers_mocks.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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