feat(mrs): mrs resources not tested

[dmicheneau]

Description of your changes

feat(mrs/cluster): Add MRS Cluster example chore(mrs/job): find an issue #140

I have:

• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

NAME                                                    READY   SYNCED   EXTERNAL-NAME     AGE
keypair.ecs.flexibleengine.upbound.io/example-keypair   True    True     example-keypair   72m

NAME                                                        READY   SYNCED   EXTERNAL-NAME                          AGE
cluster.mrs.flexibleengine.upbound.io/example-mrs-cluster   True    True     5d5e03c4-2116-4074-9619-16d7f4849033   72m

NAME                                                     READY   SYNCED   EXTERNAL-NAME                          AGE
vpcsubnet.vpc.flexibleengine.upbound.io/example-subnet   True    True     222f5569-56ec-4b40-a9d8-92b0d53644bc   72m

NAME                                            READY   SYNCED   EXTERNAL-NAME                          AGE
vpc.vpc.flexibleengine.upbound.io/example-vpc   True    True     16f0268e-a59b-4566-b7d7-a519454978aa   72m

[azrod]

Please edit title of PR. Only cluster resource has tested