chore(fast-inbox): regenerate sample inputs for A-1538/A-1539 (A-1539)

Both preceding commits change public-input layouts (`ParityPublicInputs` loses `start_sponge`,
`BlockRollupPublicInputs` loses `is_first_block`), and the block-root VK indices move, so the committed rollup sample
inputs carry a stale ABI and a stale `vk_tree_root`.

Regenerated through the canonical path — `AZTEC_GENERATE_TEST_DATA=1 yarn workspace @aztec/prover-client test
src/test/regenerate_rollup_sample_inputs.test.ts` — against circuits and VKs built from source. Adds the
`rollup-block-root-no-txs` sample, which the merged tx-less block root needs now that it is in the `nargo execute`
list, and drops nothing else: the samples for the deleted first-block variants went with their crates.

Verified with `nargo execute` on all eight regenerated crates (block root, block root single tx, block root no txs,
block merge, both checkpoint roots, checkpoint merge, root): every one solves its witness.

VKs, the VK tree, the generated Noir ABI types and the Solidity verifier are generated-and-gitignored, so they are not
committed here; CI rebuilds them.

Author: spalladino