Add tests for the most important functions of ButterCMS

[LukaszGudel]

Why

Because current tests moved from the StatusCake test only super simple cases probably cached by CDN.

What

Add tests to CKSMonitoring that more deeply check whether the most important system functions are working (most important from the customers’ point of view)

Below are examples of such parts:

• Dashboard (logging in, and then making sure the internal endpoints work)
• API endpoints
• Being able to update a piece of content and then see the change in the API
• Sign up
• Billing would be great, but probably not possible to test fully

Important info:

• Of course, we should add tests we are able to do using API and HTTP client (without using browser/puppeteer) - they should be quite fast (not longer than 5s)
• we need to be careful not to clutter the Butter database and affect its performance

Link to discussion on Slack: https://cksource.slack.com/archives/C0747MQGE2W/p1725011401287559

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