Seems cypress ci does not respect or handle integrationFolder parameter

[bahmutov]

When passing custom path to the integration folder (to allow running just some tests), cypress just initializes the Kitchen Sink example and runs its own tests, not mine.

[brian-mann]

What's happening here is that when cypress does not detect any cypress tests it's seeding the example kitchen sink and running those tests.

We need to do two things better:

1. Never seed tests when running cypress ci
2. If Cypress cannot detect any tests it should error and indicate the exact path it searched where there were no tests.

However this was likely caused by running cypress ci in the wrong cwd and if you hypothetically update this (or pass --config options) it will work correctly.

[jennifer-shehane]

Closing - added suggestion about never seeding when running cypress ci to #619