ManagePartitioningDialog: support disabling split-by-size and unblock edits when size split is disabled

[Copilot]

The Manage Partitioning dialog treated splitSize as always required (> 0), which blocked two flows: disabling size-based auto-partitioning and editing min/max when SizeToSplit = 0. This change makes size split explicitly toggleable and aligns validation + SQL generation with that toggle.

• Form model + dialog behavior

  • Added splitSizeEnabled to ManagePartitioningFormState.
  • Added a new Size toggle in ManagePartitioningDialog.
  • When disabled, split-size input/unit are disabled and no longer gate form validity.
  • When enabled, split-size remains required and validated as positive.

• Validation logic

  • Updated managePartitioningSchema to conditionally require splitSize only when splitSizeEnabled === true.
  • Kept existing bounds checks (max bytes, min 1 MB) only for enabled size split.

• Initial state mapping

  • Updated prepareManagePartitioningDialogConfig:
    • SizeToSplit > 0 → splitSizeEnabled: true, prefill size/unit.
    • SizeToSplit = 0 → splitSizeEnabled: false, empty split-size field.
  • This prevents invalid-on-open state for tables with size split disabled.

• Request/SQL wiring

  • Added splitBySize to UpdateTablePartitioningValues.
  • Updated request preparation to send splitBySize from dialog state.
  • Updated SQL builder to emit AUTO_PARTITIONING_BY_SIZE = ENABLED|DISABLED instead of always ENABLED.

• Focused coverage

  • Added tests for conditional schema behavior (enabled vs disabled split size).
  • Added tests for request/SQL behavior when size split is disabled.

// tablePartitioning.ts
const bySize = values.splitBySize ? 'ENABLED' : 'DISABLED';

ALTER TABLE `...` SET (
  AUTO_PARTITIONING_BY_SIZE = ${bySize},
  AUTO_PARTITIONING_PARTITION_SIZE_MB = ${values.partitionSizeMb},
  AUTO_PARTITIONING_MIN_PARTITIONS_COUNT = ${values.minPartitions},
  AUTO_PARTITIONING_MAX_PARTITIONS_COUNT = ${values.maxPartitions},
  AUTO_PARTITIONING_BY_LOAD = ${byLoad}
)

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