Bump typescript-eslint to 8.x

[trivikr]

Fixes: https://github.com/bluesky-social/atproto/issues/2997

This PR:

• Updates typescript-eslint to 8.x, and TypeScript unsupported warning is no longer thrown
• Removes/replaces deprecated @typescript-eslint/ban-types rule.
• Turns off new rules which failed. These can be enabled in a separate PR if needed
  • @typescript-eslint/no-require-imports
  • @typescript-eslint/no-unused-expressions