`zombienet`: warp-sync tests for validators (#13078)

* zombienet validators warp sync draft

Sketch of warp-sync test for validators.
Not tested.

Follow-up of: #12769

* yet another warp-sync scenario added

- all validators are synced from DB,
- some full nodes are synced from DB,
- full-node is warp-synced

* fixes

* fixes

* missing files

* path fixed

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Co-authored-by: parity-processbot <>