chore: add acceptance checkbox to pr template

[eliobischof]

We have acceptance tests now.
This PR adds some guidance about our expectations on new PRs regarding acceptance tests.
Also, it clarifies how the goals of integration and acceptance tests differ.

Completes #7
Relates to #51

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• Vitest unit tests ensure that components produce expected outputs on different inputs.
• Cypress integration tests ensure that login app pages work as expected. The ZITADEL API is mocked.
• No debug or dead code
• My code has no repetitions

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Name	Status	Preview	Comments	Updated (UTC)
typescript-login	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 5, 2024 0:46am

[eliobischof]

@peintnermax please mark the check for acceptance tests as required