Backport of Fix CICD docker image rate limits. into release/1.15.x (#20363)

Fix CICD docker image rate limits.

The docker image used in CICD was referencing `registry.k8s.io/pause:3.3`,
which appears to no longer function correctly. This commit swaps over to a
Hashicorp mirrored image that shouldn't have rate limits or disappearing
images.

Co-authored-by: Derek Menteer <derek.menteer@hashicorp.com>

test/integration/consul-container/libs/cluster/container.go

@@ -525,7 +525,7 @@ func startContainer(ctx context.Context, req testcontainers.ContainerRequest) (t
 	})
 }
 
-const pauseImage = "registry.k8s.io/pause:3.3"
+const pauseImage = "hashiderek/pause"
 
 type containerOpts struct {
 	configFile        string