fix(kubernetes): consider workload not ready when scaled to 0 (#543)

* test(kubernetes): use testcontainers for test

* fix(kubernetes): get state properly reports the workload as down when scaled to 0

* refactor(kubernetes): split provider in multiple files

* refactor(provider): use Instance prefix for actions

* test(testcontainers): use provider.PullImage

* squash

* Revert "test(testcontainers): use provider.PullImage"

This reverts commit 6f958c48a5.

* test: add random generator thread safety

pkg/provider/kubernetes/instance_list.go

@@ -0,0 +1,21 @@
+package kubernetes
+
+import (
+	"context"
+	"github.com/sablierapp/sablier/app/types"
+	"github.com/sablierapp/sablier/pkg/provider"
+)
+
+func (p *KubernetesProvider) InstanceList(ctx context.Context, options provider.InstanceListOptions) ([]types.Instance, error) {
+	deployments, err := p.DeploymentList(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	statefulSets, err := p.StatefulSetList(ctx, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return append(deployments, statefulSets...), nil
+}