test: Add integration test reproducing the LastValidators exceeding MaxValidators bug

Walkthrough

The recent changes introduce a new test function, TestTooManyLastValidators, across multiple files in the codebase. This function simulates scenarios where validators are jailed and unjailed, validator set changes are applied, and validator set updates are verified, ultimately leading to a panic due to inconsistent state in the staking module. Additionally, new methods have been added to the TestStakingKeeper interface and its mock implementation to support these test scenarios.

Changes

File Path	Change Summary
`tests/integration/unbonding.go`	Added `TestTooManyLastValidators` to `CCVTestSuite` to simulate and test panic scenarios.
`testutil/integration/debug_test.go`	Added `TestTooManyLastValidators` to test last validator scenarios.
`testutil/integration/interfaces.go`	Added `GetParams`, `SetParams`, and `ApplyAndReturnValidatorSetUpdates` to `TestStakingKeeper`.
`testutil/keeper/mocks.go`	Added `GetParams` and `SetParams` methods to `MockStakingKeeper` and its mock recorder.

Sequence Diagram(s)

sequenceDiagram
    participant Tester
    participant CCVTestSuite
    participant StakingKeeper
    participant ValidatorSet

    Tester->>CCVTestSuite: Call TestTooManyLastValidators()
    CCVTestSuite->>StakingKeeper: Jail validators
    CCVTestSuite->>ValidatorSet: Apply validator set changes
    ValidatorSet-->>CCVTestSuite: Return updated validator set
    CCVTestSuite->>StakingKeeper: Unjail validators
    CCVTestSuite->>ValidatorSet: Verify validator set updates
    ValidatorSet-->>CCVTestSuite: Return final validator set
    CCVTestSuite-->>Tester: Panic due to inconsistent state

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cosmos / interchain-security