Valildate that OutputReceiver<Row> is only allowed if the output PCollection has a schema
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core
java
P3
sub-task
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Description
We don't do this today as coder/schema inference may not be complete at the point where we validate.
Imported from Jira [BEAM-4450](https://issues.apache.org/jira/browse/BEAM-4450). Original Jira may contain additional context.
Reported by: reuvenlax.
Subtask of issue #18898
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