refactor: use mocks for x/auth testing + ante tests refactor (#12568)

## Description

Main changes:
#### `x/auth` and `x/auth/ante` stopped depending on simapp
Some usages are left but this PR grew too much, so we might want to do it in a separate.

#### Removed all usages of the `suite` in `ante`
This makes tests way more verbose but helps keep the test cases self-contained and easier to understand (before you would need to mentally track the state of the suite throughout the test cases to understand them).
Also, it's easier to test, given that all tests are converted to standard Go unit tests (`func TestSomething(t *testing.T){`) and at least VSCode recognizes them and lets you run a single one instead of the entire suite.
I think this can/should be replicated in other modules.

Closes: #12502



---

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- [x] added `!` to the type prefix if API or client breaking change
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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
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scripts/mockgen.sh

@@ -15,4 +15,6 @@ $mockgen_cmd -source=x/feegrant/expected_keepers.go -package testutil -destinati
 $mockgen_cmd -source=x/mint/types/expected_keepers.go -package testutil -destination x/mint/testutil/expected_keepers_mocks.go
 $mockgen_cmd -source=x/params/proposal_handler_test.go -package testutil -destination x/params/testutil/staking_keeper_mock.go
 $mockgen_cmd -source=x/crisis/types/expected_keepers.go -package testutil -destination x/crisis/testutil/expected_keepers_mocks.go
+$mockgen_cmd -source=x/auth/types/expected_keepers.go -package testutil -destination x/auth/testutil/expected_keepers_mocks.go
+$mockgen_cmd -source=x/auth/ante/expected_keepers.go -package testutil -destination x/auth/ante/testutil/expected_keepers_mocks.go
 $mockgen_cmd -source=x/bank/types/expected_keepers.go -package testutil -destination x/bank/testutil/expected_keepers_mocks.go