[OLM] Convey an operator is installing in OperatorHub

Today it can be confusing to users to see operators in OperatorHub with an 'Installed' badge when really that just indicates the Subscription has been created (and so the user can't create another Subscription as the Install button is disabled.) Occasionally the install process can require more user input (manual approval) or may fail, and the operator isn't actually usable or installed, but still has the 'Installed' badge on operatorhub. This was raised via RFE-1691

OperatorHub should somehow convey (using the same criteria the installing screen uses) that the install process is still running, and link the user to the operator details or similar location.

UX Design: https://github.com/openshift/openshift-origin-design/pull/552 

Outdated design doc: https://docs.google.com/document/d/1_YylQbRfFO0CI5Lmf9UDOHuIeOULHBY3vicI1x_RE38/edit?usp=sharing