Fix 1934: mix burn block height into microblock pubkey #2052
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Description
Fix #1934 by mixing the burn block height into the microblock private key rotation. When attempting RBF, don't rotate the private key (this is just to make testing more deterministic).
Type of Change
Bug fix
Does this introduce a breaking change?
No
Are documentation updates required?
No
Testing information
These changes are covered in existing tests, and required updating two tests' "find_microblock_key" logic.