Fail Javadoc aggregateJavadoc task if there's an error

[y1chi]

Please add a meaningful description for your change here

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[y1chi]

R: @TheNeuralBit

[TheNeuralBit]

Is there a precommit that will catch changes that break this?

[y1chi]

I think beam_PostCommit_Javadoc does that

[y1chi]

Run Javadoc PostCommit

[y1chi]

Run Javadoc PostCommit

[y1chi]

Run Java PreCommit

[y1chi]

Run Java_Examples_Dataflow_Java17 PreCommit

[y1chi]

Run Java_Examples_Dataflow_Java11 PreCommit