Consider removing `localExecutionSupported` param from executor functions

Currently, we have three variables to take into account to decide whether local execution is supported or not when executing a DDL command.
- Global local execution state (CurrentLocalExecutionStatus)
- DistributedExecution->localExecutionSupported
- Task->cannotBeExecutedLocally

Looking into the code, the last two seem to have the same meaning in most contexts. So we might want to throw away `localExecutionIsSupported` totally.

Even more, we can get rid of `Task->cannotBeExecutedLocally` too and introduce one more enum value into `LocalExecutionStatus` such as `LOCAL_EXECUTION_NOT_SUPPORTED` to simplify things even more.

That way, we will only need to consider (or specify) `CurrentLocalExecutionStatus` before / during the execution.