mount sticky disk with noinit_itable to stop repeated lazy-init writes (release/v2)

[piob-io]

Summary

Same change as #123, applied to release/v2: mount the builder sticky disk with -o noinit_itable so the ext4lazyinit kernel thread doesn't zero the uninitialized inode tables (a non-trivial portion of the device) in the background. On copy-on-write clones of a snapshot taken before lazy init finished, that zeroing replays on every clone and is discarded with it — pure wasted Ceph write load. The zeroing is unnecessary for correctness (checksummed group descriptors track unused inodes; unallocated blocks on the thin-provisioned device read back as zeroes).

Link to Devin session: https://app.devin.ai/sessions/1054a9452e8a49ccb891391e2327a612
Requested by: @piob-io

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