Writer: ensure batching logic factors in message headers #1132
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Currently, the decision to include a message in a batch does not consider headers, so you can get payloads that are larger than intended if you are close to your upper limit and then include headers. This adds a new test for batching with headers that failed and then a fix was added to correct the failing test. This also updates another test that began failing once we included the header length in this calculation.
This closes #1050