Simplify setting up the prerequisite entities for integration tests

[carltonwhitehead]

Currently, integration tests that depend on many entities to already exist are quite verbose. Consider that an integration which would verify that a time can be added to a run would have to set up at least the following prerequisites:

1. Create a handicap group
2. Create a handicap group set with the created handicap group
3. Create a competition group
4. Create a competition group set with the created competition group
5. Create an event with the handicap group set and competition group set
6. Create a registration
7. Create a run with the registration

All of the above steps would be good candidates for code reuse among other and existing integration tests.

[carltonwhitehead]

After looking through the integration test code, I've decided not to "fix" this since it would remove too much relevant context from the integration tests themselves, and create a lot of additional code to maintain. Doesn't seem worth the effort.