Add extensive test cases for possible "invalid" blocks

[janniks]

Not all possible reasons for not being valid are tested currently. e.g. https://github.com/stacks-network/stacks-core/blob/2be69cbf744ac339476362a3fb281257c9e1bebc/testnet/stacks-node/src/tests/signer/v0.rs#L39

Create more tests.

Possible errors for ValidateRejectCode:

• [ ] BadBlockHash = 0 -> build on top of this function
• [ ] BadTransaction = 1 -> build on top of the same validate function as BadBlockHash
• [x] InvalidBlock = 2 - unit test and integration test
• [x] ChainstateError = 3 - integration test
• [x] UnknownParent = 4 - integration test
• [x] NonCanonicalTenure = 5 - integration test
• [x] NoSuchTenure = 6 -> same integration test as NonCanonicalTenure

All functions that aren't yet tested are part of theimpl NakamotoBlockProposal.

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To do: Construct bad block proposal and submit to the signers. See how the signers deal with it.