Added example for using dashboard container by value
1.1 Refactored embeddable explorer e2e test to use new example, removed not needed kbn_tp_embeddable_explorer plugin.
For embeddable explorer examples went away from using getFactoryById() to improve type checks
There is new component a replacement for EmbeddableFactoryRenderer with slightly more flexible api: EmbeddableRenderer.
3.1 We can improve it going forward to support more use case