added manger to keep track of go routines in the services (#2869)

- added manager to wait for all go routines to end before exit
- code refactor
- renamed Manafer to Interface and GoRoutineManager to GroupManager
- replaced some go routine calls with manager Add func
- added unit tests for manager

pkg/utils/manager/manager_test.go

@@ -0,0 +1,65 @@
+package manager
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestAddAndWait(t *testing.T) {
+	mgr := New()
+
+	value := 10
+	expectedValue := 11
+
+	mgr.Add(context.Background(), func(ctx context.Context) {
+		time.Sleep(1 * time.Second)
+		value = expectedValue
+	})
+
+	mgr.Wait()
+	require.Equal(t, expectedValue, value, "manager did not wait for go routine to complete")
+}
+
+func TestAddWithContextCancel(t *testing.T) {
+	mgr := New()
+
+	value := 10
+	expectedValue := 11
+
+	ctx, cancel := context.WithCancel(context.Background())
+
+	mgr.Add(ctx, func(ctx context.Context) {
+		<-ctx.Done()
+		value = 11
+	})
+
+	go cancel()
+	mgr.Wait()
+	require.Equal(t, expectedValue, value, "manager did not wait for go routine to complete when context is cancelled")
+}
+
+func TestAddAndWaitWithTimeout(t *testing.T) {
+	mgr := New()
+
+	value := 10
+
+	mgr.Add(context.Background(), func(ctx context.Context) {
+		time.Sleep(2 * time.Second)
+	})
+
+	err := mgr.WaitWithTimeout(1 * time.Second)
+	require.NotNil(t, err, "manager WaitWithTimeout did not return an error when timeout exceeded")
+
+	expectedValue := 11
+	mgr.Add(context.Background(), func(ctx context.Context) {
+		time.Sleep(100 * time.Millisecond)
+		value = expectedValue
+	})
+
+	err = mgr.WaitWithTimeout(1 * time.Second)
+	require.Nil(t, err, "manager returned error even though all go routins completed successfully before timeout")
+	require.Equal(t, expectedValue, value)
+}