ENSAdmin: transition all mock data to be stored in `.ts` instead of `.json`

[Y3drk]

Goal

Transition all mock data to be stored in .ts files instead of .json, for reasons listed in this discussion.

Commit d5a0832 shows an example how this transition should be done, by performing it for the /mock/indexing-status/data.json

Requirements

• All data for mocked components should be stored in .ts files
• Apply some strategy to purposefully break the .ts definition for the mock cases of deserialization errors.
• Adjust page.tsx for every mocked component