Add CM Data Notification background Load to K6
- Implement Kafka message producer with controlled throughput
- Configured message rate to 1000 (default: 500).
- Implemented constant-arrival-rate scenario to maintain controlled throughput.
- Adjusted maxVUs from 1000 to prevent resource overload.
- Added graceful shutdown with a 10s stop period.
- Added it into main K6 suite
Issue-ID:CPS-2587
Change-Id: I75fd1fa83892fd4775b27132059f73e9c0ea4d75
Signed-off-by: sourabh_sourabh <sourabh.sourabh@est.tech>