apache / apache/beam

Replace Flink StreamingImpulseSource with generic timer-based source

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flink improvement P3 runners
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Description

The `StreamingImpulseSource` is a Flink Runner specific transform for load tests. Now that timers are supported, we should look into whether a timer-based generator could generate the same load as the current source. This would allow us to remove the proprietary implementation.

Imported from Jira [BEAM-8353](https://issues.apache.org/jira/browse/BEAM-8353). Original Jira may contain additional context.
Reported by: mxm.

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