feat: cypress integration tests

[UnicornChance]

Description

Adding cypress integration testing for UDS Core + UDS Identity Config. This tests user authentication and registration processes that can be affected by changing Identity config images.

At this time it's utilizing a test realm.json that disables email verification, MFA, and OCSP checking. Obviously this creates a disparity between realm files, so this issue has been created for hopefully building out more robust integration tests that can also test the email verification and MFA.

Has been re-based against main, so merge conflicts should be resolved.

Tested this in private CI and its work as well as locally. Docs have been included to explain the uds task as well as the different currently implemented tests and how to update the certs that are used by the tests.

To run the tests:
uds run uds-core-integration-tests

Related Issue

Relates to #27

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request) followed

[mjnagel]

Overall this looks great - really appreciate the work that went into it!