Revisit the `clarity_vm` code paths once the chainstate is fully MARF'ed

[obycode]

          Approving for now, but please open an issue to revisit the `clarity_vm` code paths once the chainstate is fully MARF'ed.  Thanks!

Originally posted by @jcnelson in https://github.com/stacks-network/stacks-core/pull/4846#pullrequestreview-2133101343

[obycode]

For example, get_first_block_in_tenure can be simplified once that work is complete:

Broadly speaking, this is just a placeholder. When the chainstate is fully MARF'ed, the code here will instead simply query the headers MARF for the given Stacks block's first-tenure block (literally 3 lines of code).

https://github.com/stacks-network/stacks-core/pull/4846#discussion_r1649222919

[blockstack-devops]

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