[Java] Sync Kinesis partitionKey format with Kafka implementation

[dolfinus]

Problem

See #2616 (comment)

Solution

One-line summary:

Change format of Kinesis partitionKey from {jobNamespace}:{jobName} to run:{jobNamespace}/{jobName}, to match Kafka transport implementation.

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SPDX-License-Identifier: Apache-2.0
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[pawel-big-lebowski]

@dolfinus could you resolve the conflict so we can merge it?