Fix Test Suite

[mattezra]

Fixes #64

Updates done:

• updated media URLs to use the new URLs
• created a dedicated instance that will be used for the tests
• added TEST_PREVIEW_LOCK_PASSWORD in the .env to get uncached content from the updateView test
• cleaned up before hook tests to only be executed once for each test file
• added deletion on resource creation tests to cleanup instance
• skipped model and field creation test to ensure that we don't hit the limit of fields allowed in a model
• fixed findAndReplace test

Note:
Sent to keybase the env variables that the tests will be ran against (cc @markelmad)