MM-56876: Redis: first introduction (#27752)

```release-note
NONE
```

---------

Co-authored-by: Jesús Espino <jespinog@gmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/platform/services/cache/provider_test.go

@@ -161,7 +161,7 @@ func TestNewCache_Striped(t *testing.T) {
 func TestConnectClose(t *testing.T) {
 	p := NewProvider()
 
-	err := p.Connect()
+	_, err := p.Connect()
 	require.NoError(t, err)
 
 	err = p.Close()