chore: Copy `aws.ConfigFromURL` function from `grafana/dskit` (#16777)

`dskit` is about to upgrade the AWS client SDK from v1 to v2 and the only thing that blocks them is the `ConfigFromURL` function.

Since Loki uses the function for their deprecated legacy AWS clients, we move the function into the Loki code base for the time being.

---
Signed-off-by: Christian Haudum <christian.haudum@gmail.com>

pkg/storage/chunk/client/aws/dynamodb_storage_client.go

@@ -18,7 +18,6 @@ import (
 	"github.com/aws/aws-sdk-go/service/dynamodb"
 	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbiface"
 	"github.com/go-kit/log/level"
-	awscommon "github.com/grafana/dskit/aws"
 	"github.com/grafana/dskit/backoff"
 	"github.com/grafana/dskit/flagext"
 	"github.com/grafana/dskit/instrument"
@@ -802,7 +801,7 @@ func awsSessionFromURL(awsURL *url.URL) (client.ConfigProvider, error) {
 	if len(path) > 0 {
 		level.Warn(log.Logger).Log("msg", "ignoring DynamoDB URL path", "path", path)
 	}
-	config, err := awscommon.ConfigFromURL(awsURL)
+	config, err := ConfigFromURL(awsURL)
 	if err != nil {
 		return nil, err
 	}

pkg/storage/chunk/client/aws/s3_storage_client.go

@@ -20,14 +20,11 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/aws/aws-sdk-go/service/s3/s3iface"
-	awscommon "github.com/grafana/dskit/aws"
-
 	"github.com/grafana/dskit/backoff"
 	"github.com/grafana/dskit/flagext"
 	"github.com/grafana/dskit/instrument"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
-
 	amnet "k8s.io/apimachinery/pkg/util/net"
 
 	bucket_s3 "github.com/grafana/loki/v3/pkg/storage/bucket/s3"
@@ -194,7 +191,7 @@ func buildS3Client(cfg S3Config, hedgingCfg hedging.Config, hedging bool) (*s3.S
 
 	// if an s3 url is passed use it to initialize the s3Config and then override with any additional params
 	if cfg.S3.URL != nil {
-		s3Config, err = awscommon.ConfigFromURL(cfg.S3.URL)
+		s3Config, err = ConfigFromURL(cfg.S3.URL)
 		if err != nil {
 			return nil, err
 		}

vendor/modules.txt

@@ -1054,7 +1054,6 @@ github.com/grafana/ckit/shard
 github.com/grafana/cloudflare-go
 # github.com/grafana/dskit v0.0.0-20241007172036-53283a0f6b41
 ## explicit; go 1.21
-github.com/grafana/dskit/aws
 github.com/grafana/dskit/backoff
 github.com/grafana/dskit/cancellation
 github.com/grafana/dskit/concurrency