Allow other retry configs to influence DynamoDB extended retries

[mullermp]

Fixes #3172

[mullermp]

@dankochime

[github-actions]

Detected 6 possible performance regressions:

• aws-sdk-s3.require_mem_allocated_kb - z-score regression: 6582.24 -> 6601.9. Z-score: 109.33
• aws-sdk-sns.require_mem_allocated_kb - z-score regression: 6547.18 -> 6567.1. Z-score: 114.16
• aws-sdk-kinesis.require_mem_allocated_kb - z-score regression: 6547.26 -> 6566.98. Z-score: 115.91
• aws-sdk-core.require_mem_allocated_kb - z-score regression: 6520.84 -> 6540.46. Z-score: 82.75
• aws-sdk-cloudwatchlogs.require_mem_allocated_kb - z-score regression: 6547.18 -> 6567.02. Z-score: 86.73
• aws-sdk-cloudwatch.require_mem_allocated_kb - z-score regression: 6547.73 -> 6567.57. Z-score: 110.29