Remove logical schema propagation #3177
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Schema propagation is now handled in the physical plan to ensure all ports, both external and internal, have an associated schema. As a result, schema propagation in the logical plan is no longer necessary.
In addition, workflow context was used to give user information so that schema propagation can resolve file names. This is also no longer needed as we are resolving files through an explicit call as a step of compiling. WorkflowContext is no longer needed to be set to Logical Operator.