Warp sync zombienet tests: add basic BEEFY checks (#2854)

Part of https://github.com/paritytech/polkadot-sdk/issues/2787

This is an initial PR that adds some basic BEEFY checks to the warp sync
zombienet tests. To be more specific, it does the following:
- Changes the snapshot used by the warp sync zombienet tests to one
built from an updated version of the kitchensink runtime, that supports
BEEFY
- Adds some basic BEEFY checks to the warp sync zombienet tests
- Deduplicates some params of the warp sync zombienet tests, making them
easier to extend