change(tests): Remove Matches on Network From Tests

[idky137]

Motivation

We would like to implement regtest mode in zebrad to allow development to move away from relying on zcashd for testing. (https://forum.zcashcommunity.com/t/zingo-onward/43945/44)

As Per #7967 we have decided to implement this in multiple stages, to ease the process of merging code.

This PR completes point 1 in #7968.

Closes #8325.

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Solution

We have added a new set of methods for Network in Zebra-chain to remove the reliance on matching on the Network type and to move code fetching test vectors into a single file.

Testing

This PR effects tests in Zebra-Chain, Zebra-Consensus, Zebra-RPC, Zebra-GRPC, Zebra-Scan, Zebra-State and Zebrad.

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[mpguerra]

Thank you for the PR! We will review and discuss as a team to decide how to proceed with this one.

[AloeareV]

We're following the steps here #7968 as a starting point

[zancas]

@AloeareV this #7967 (comment) is more detailed than #7968.

[idky137]

Currently implements the first point in #7968. However new vector fetching functionality has been implemented as methods on Network, held in zebra-chain/src/test_utils/.

[idky137]

changed scope of PR to ease merging.

[AloeareV]

fixes #8325, thanks for issuing this!

[arya2]

Thank you for these changes!!

The first 13 commits are looking good and ready to merge once CI passes.

The only change I think is needed is removing the serialization error variant or hiding it behind #[cfg(test)].

If there's interest in implementing #8326 or #7968, please do these in follow-up PRs so the changes are easy to test and review.

We want the Zebra team to implement the issues following #7968 in #7845 for adding parameters, because those changes may have far-reaching implications across the codebase, and we expect context and familiarity with the Zebra codebase will make it easier to implement those changes correctly.

Note: We just started a hack sprint, so reviews on those changes may be delayed until our next sprint.

[arya2]

Thank you!