Generate valid states and blocks for CI testing

[dapplion]

Describe the bug

Current master depends on Infura to download some states and blocks for benchmarking. While this has worked fine before currently Infura timeouts for all requests. The problem is that these states are really old and Infura places some limit on the credentials. I've rotated the credentials with a new account but it still timeouts.

Depending on external services weakens our CI. This issue is blocking #3995

Proposed solution

Build generic infra to generate valid states and blocks on demand and cache them locally. We already have something like that for benchmarking but should be extended and persisted.

[philknows]

Related to #4031. Need to also generate state in the benchmark with >1M validators instead of 250_000

[philknows]

Related to #4031. Need to also generate state in the benchmark with >1M validators instead of 250_000 @tuyennhv

[wemeetagain]

iirc @matthewkeil may have done something related this?