Summary

This addresses an issue raised in support topic where in-house analytics (which are supposed to lack a type attribute) are

• Remove required attribute from Type input field and server-side validation.
• Omit type from amp-analytics tag when Type is empty.
• Remove the unnecessary readonly ID input field from the form entries.
• Use UUID to generate unique IDs rather than hashing type and contents.
• Stop needlessly showing truncating ID in entry heading on admin screen, and use ordered list instead to differentiate entries.

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).