[FEATURE] the __call__ method in multiagent is redundant code

[afarntrog]

Problem Statement

We should remove the __call__ methods in swarm and graph classes and use the parent base implementation automatically. They are not only redundant code but also do not account for the fix we put in that handles invocation_state

Proposed Solution

Use the inherited call method from the parent clas

Use Case

For any graph invocations

Alternatives Solutions

No response

Additional Context

No response