central_systest_blobs: carry real witness fields in the regression blobs

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PR Summary

Low Risk
Changes are confined to regression test/fixture generation in central_systest_blobs; production cende paths are unchanged aside from exercising the same commit/witness APIs already used elsewhere.

Overview
Updates the central systest blob regression factory so generated AerospikeBlob fixtures match what the batcher/OS expect: Patricia witnesses, trimmed initial reads, and recent state commitment infos with the same one-block lag as live cende recording.

Block closing now derives AccessedKeys, commits via commit_state_diff_with_witnesses on IndexDb (replacing FactsDb / commit_state_diff), trims initial_reads to accessed keys, and stores StateCommitmentInfos per block. In finalize, each blob gets the previous block’s compressed commitment infos (first blob gets none), mirroring recent_block_hashes behavior.

The GCS regression check compares blobs through to_comparable_blobs, decompressing state_commitment_infos so bincode-backed maps don’t flake across processes. GCS upload/download helpers are lightly refactored, and the pinned blob generation is bumped (55 → 58).

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• apollo_integration_tests: verify Patricia storage proofs of persisted witnesses in flow tests #14905
• apollo_integration_tests: validate cende blob witness fields in the dummy recorder #14904
• apollo_integration_tests: assert witnesses persisted for committed heights in flow tests #14903
• central_systest_blobs: publish a decoded commitment-infos companion beside the blobs #14917
• central_systest_blobs: carry real witness fields in the regression blobs #14910 👈 (View in Graphite)
• workspace,ci: remove the os_input feature (make it unconditional) #14902 : 2 other dependent PRs (#14907 , #14909 )
• main

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