test: assert root delegation caveat enforcement

[aa-eyup]

Summary

Assert chained delegations can not be used to transfer more ERC20 tokens than the root delegation permits. Tests a scenario where an initial delegation allows some amount X of ERC20 transfer which is then re-delegated allowing some amount >X and asserts that some amount >X can not be transferred.
Impacts test files only.

Motivation

• ERC20 Allowance caveats are enforced at the delegation level using a mapping from a delegation hash, so this change is meant to check the integrity of the root delegation's caveat enforcement.