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