Update all demo code to import mobx functions from '@patternfly/react-topology'

[jeff-phillips-18]

Describe the enhancement or change
Projects should import mobx functions from '@patternfly/react-topology' because we allow for different versions using:

// Configure MobX to isolate state, this allows for applications to use different versions of MobX
configure({ isolateGlobalState: true });

If the project has a different version, it is likely that topology components will not update on changes appropriately.

All demo code should use the exported version from PF topology to provide good examples and follow this practice.

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Jira Issue: PF-3488