Implement full chain workflow testing on TestLoop

[Longarithm]

This is a big issue, aiming to simplify testing of chain logic, which would allow to replace huge setups like in chunks_management and cross_shard_tx tests, and make tests deterministic. But there is a long way to that.

The closest test is https://github.com/near/nearcore/blob/7b68efbd9bdce6c97841422891866941704b1601/chain/chunks/src/test/multi.rs. It was implemented only for chunk distribution and doesn't cover arbitrary chains.

We can keep improving the situation sequentially, by implementing tests where:

• clients generate blocks and approvals and chain must move forward; there can be forks; there can be different controlled delays on block production and network distribution.
• clients also generate chunks, chunks get arbitrarily dropped, but chain still moves forward. resharding tests can be inspiring.
• clients also support partial chunk distribution - this is what multi.rs is currently about - chunks_management are inspiring here
• clients also support stateless validation, with state witness distribution, validation, and again arbitrary message drops and network delays.

Looks like Runtime won't be involved which is also great.
We can create specific issues for each step and work on that.
Note that it doesn't make much sense to migrate existing tests because TestLoop setup is quite different. We should understand test ideas and reimplement them on TestLoop.

cc @robin-near @walnut-the-cat

Old issue #8512

[Longarithm]

Already implemented in https://github.com/near/nearcore/blob/f4557ecdb26fffceddf4bf042a506b1cb639f8ab/integration-tests/src/tests/client/features/multinode_test_loop_example.rs