Remove dependency to SeeAllData

Using SeeAllData=True is against best practices documented https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_seealldata_using.htm

Since ConnectAPIs are not accessible in data silo'd tests, it would be great to see these examples reworked to use a mock/stubbing framework instead of requiring tests to see all data in an org.

Financial Force has published a robust [example of a mock/stubbing framework](https://github.com/apex-enterprise-patterns/fflib-apex-mocks) but, it would be fantastic to have something for salesforce developers leveraging Connect APIs like this to be able to plug-and-play from this repo.