chore(e2e): fill out `_rules` API with toResourceRules

[johncowen]

Various changes to make it easier to work with the new toResourceRules in the _rules HTTP endpoint:

1. Use the generated types for the mocks
2. Uses KUMA_CLUSTER_NAME to allow you to set a clusterName that is always filled with rules so you can see these during development.
3. Adds MeshTLS to the mocks for /policies

More upstream changes are required to generate the resulting TS in this PR.

Note: The structure for toResourceRules is going to change soon, by using the auto generated types this should make the work easier moving forwards when such changes are made. ~There is more work required later to convert our data re-shaping to use the auto generated types rather than the handwritten ones.~ 👈 I added a further commit on the end here to do this here.