[indexer_autoscaler_lambda] tune Lambda reserved concurrency instead of ESM concurrency #7
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Since we're hard limited to a maximum concurrency of 1000 on the event source mapping but not on the reserved concurrency on the Lambda itself, this updates the autoscaler to tune the reserved concurrency on the Lambda instead of the concurrency on the ESM.
This also adds a maximum concurrency value since now it's possible for the max to be over 1000, as set by the client.
How tested?