Module hiero-base miss tests for functionality of AccountClientImpl.deleteAccount

[hendrikebbers]

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👾 Description of the issue

In the hiero-base module, the AccountClientImpl class implements two overloaded deleteAccount methods for deleting an account, optionally transferring its remaining balance to another account. However, these methods currently lack unit and integration tests. Scenarios such as successful deletion, deletion with balance transfer, invalid account inputs, and exception handling (e.g., HieroException) are not tested, leaving the functionality prone to errors and regressions.

Suggested solution

Create a new test class or extend the existing test suite for AccountClientImpl to include tests for both deleteAccount methods. Follow the established testing pattern using JUnit to verify positive scenarios, such as successful account deletion and balance transfer, as well as negative scenarios, including invalid accounts and error conditions.

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[IamLRBA]

@hendrikebbers may i be assigned this issue please.
Thanks!