feat: add unit tests to cover code changes introduced in v2.0.4 #511
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This pull request adds new tests to improve coverage of validator removal scenarios in the stake pool program. The tests ensure correct handling when removing validators, particularly those with transient stake, and verify that stake decrease operations fail as expected after removal.
Validator removal and stake deactivation logic:
DeactivatingAlland triggers deactivation of both stake accounts. This ensures the pool handles stake transitions safely when a validator is removed.Decrease stake error handling:
ValidatorNotFounderror, covering all relevant decrease instruction types. This guards against unauthorized stake changes after validator removal.