CORS-4078: bump AWS SDK v2 max backoff duration to 300s

In AWS SDK v2, the SDK implements an exponential backoff and jitter but
with a 20s max backoff duration. This can cause the installer to
aggressively retry.

In SDK v1, this value was 300s. Thus, bumping the max backoff duration
back to 300s as it was a good fit for the installer previously.

Reference:

SDK v2: https://github.com/aws/aws-sdk-go-v2/blob/88da3c8c5569dece0e99802dab638faa047a0db0/aws/retry/standard.go#L30-L31
SDK v1: https://github.com/aws/aws-sdk-go/blob/070853e88d22854d2355c2543d0958a5f76ad407/aws/client/default_retryer.go#L48-L49

Author: tthvo

pkg/asset/installconfig/aws/sessionv2.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"time"
 
 	survey "github.com/AlecAivazis/survey/v2"
 	"github.com/aws/aws-sdk-go-v2/aws"
@@ -31,6 +32,9 @@ const (
 
 	// RetryMaxAttempts is the total number of times an API request is retried.
 	RetryMaxAttempts = 25
+
+	// RetryBackoffDuration is max duration between retried attempts.
+	RetryBackoffDuration = 300 * time.Second
 )
 
 var (
@@ -47,6 +51,12 @@ func getDefaultConfigOptions() ConfigOptions {
 			return retry.NewStandard(func(so *retry.StandardOptions) {
 				so.MaxAttempts = RetryMaxAttempts
 
+				// The SDK v2 implements exponential backoff and jitter by default, but with 20s max backoff duration,
+				// which can cause the installer to aggressively retry.
+				// Thus, setting this to a higher value to allow more rest time and ease AWS API load.
+				// In SDK v1, this value was also 300s: https://github.com/hashicorp/terraform-provider-aws/issues/36837
+				so.Backoff = retry.NewExponentialJitterBackoff(RetryBackoffDuration)
+
 				// The SDK v2 introduces a new client-side rate-limiting mechanism in the standard retry.
 				// The default settings are not a good fit for the installer, especially the destroy code.
 				// Until we figure out a good settings, we disable it to align with SDK v1 behavior.