aws: disable client-side rate limiting by default

Issuing many S3 uploads in quick succession causes the following
error:

operation error S3: PutObject, failed to get rate limit token, retry quota exceeded, 0 available, 5 requested

Disable this to restore the behavior of SDK v1.

Relates to #3496

aws/aws.go

@@ -22,6 +22,9 @@ import (
 	"strconv"
 
 	awsv2 "github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/aws/ratelimit"
+	"github.com/aws/aws-sdk-go-v2/aws/retry"
+	"github.com/aws/aws-sdk-go-v2/config"
 	awsv2cfg "github.com/aws/aws-sdk-go-v2/config"
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/client"
@@ -251,5 +254,14 @@ func V2ConfigFromURLParams(ctx context.Context, q url.Values) (awsv2.Config, err
 		opts = append(opts, awsv2cfg.WithEndpointResolverWithOptions(customResolver))
 	}
 
+	// SDK v2 adds client-side rate limiting: https://aws.github.io/aws-sdk-go-v2/docs/configuring-sdk/retries-timeouts/#client-side-rate-limiting
+	// This can cause "failed to get rate limit token" errors. Disable this to restore
+	// the behavior of SDK v1.
+	opts = append(opts, config.WithRetryer(func() awsv2.Retryer {
+		return retry.NewStandard(func(o *retry.StandardOptions) {
+			o.RateLimiter = ratelimit.None
+		})
+	}))
+
 	return awsv2cfg.LoadDefaultConfig(ctx, opts...)
 }