Plugin count numbers in the Cluster Dashboard Dynamic Plugins popover can be incorrect when the console is running in development mode

Description of problem: When running in development mode [1], the Loaded enabled plugin count numbers in the Cluster Dashboard Dynamic Plugins popover may be incorrect. In order to make the experience less confusing for users working with the console in development mode, we need to:

• add a switch (SERVER_FLAG?) to identify the console is running dev mode
• update the Cluster Dashboard Dynamic Plugins popover to only show plugins running in dev mode
• update the Console plugins list (e.g., /k8s/cluster/operator.openshift.io~v1~Console/cluster/console-plugins) to only show plugins running in dev mode
• update https://github.com/openshift/console/blob/master/frontend/packages/console-dynamic-plugin-sdk/README.md#plugin-development

Note there is additional work planned in https://issues.redhat.com/browse/CONSOLE-3185. This bug is intended to only capture improving the experience for development mode.

[1] https://github.com/openshift/console/blob/master/frontend/packages/console-dynamic-plugin-sdk/README.md#plugin-development