chore: Change clawback vesting account tests to table-driven tests

[mattverse]

Description

Changes existing tests for clawback vesting account to table-driven tests.

Commented out the first test case that has been added since it was giving “division by zero error” when calling method TokensFromSharesTruncated for the first test case. GetDelegation returns 60 shares while GetDelegatorShares() returns 0.00 which results in a division by zero error in the TokensFromSharesTruncated method. Details on why the first test case is giving errors is yet to be known.

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