fix(forwarder): cap number of concurrency SQS tasks #90

Job	Run time
Run tests / Run Go tests	48s
Run tests / Lint Go	51s
Run tests / Validate SAM templates	30s
Upload SAM assets / Check permissions	2s
Upload SAM assets / Package and upload SAM apps	1m 8s
Run integration tests / Provision DCE for tests	14s
Run integration tests / Run integration test (config)	3m 50s
Run integration tests / Run integration test (configsubscription)	3m 3s
Run integration tests / Run integration test (firehose)	5m 56s
Run integration tests / Run integration test (forwarder)	5m 41s
Run integration tests / Run integration test (forwarder_s3)	4m 1s
Run integration tests / Run integration test (logwriter)	5m 49s
Run integration tests / Run integration test (metricstream)	3m 50s
Run integration tests / Run integration test (simple)	31s
Run integration tests / Run integration test (stack)	9m 6s
Run integration tests / Cleanup	19s
	45m 39s

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