BugFix in cirq.map_operations
#6155
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cirq.map_operationsraises an error right now in the case where you map more than one operation in the same moment to an op-tree that acts on overlapping qubits. A trivial example is the case where you map everyoptoop.controlled_by(fixed_qubit).This PR fixes the bug. See the newly added test for more context, which fails in the current version and passes after the change in this PR.