[Odometer] DRY shared camera logic between IOURequestStepScan and Odometer image capture

[Julesssss]

Parent issue: #71841

Follow up improvement issue from #82432

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The Odometer image capture flow (IOURequestStepDistanceOdometerScan) duplicates significant logic from src/pages/iou/request/step/IOURequestStepScan/index.native.tsx. Extract shared functions/hooks/components to be reused in both places.

Improvements include: (some were already applied to PR updates)

• Remove useEffect watching focusPoint - call focusCamera directly from tap
  gesture handler
• Missing return after showCameraAlert() when camera.current
• tapGesture / capturePhoto duplication
• Child components
• CONSISTENCY-6: Missing .catch() on cropImageToAspectRatio().then()
• CONSISTENCY-5: eslint-disable at line 408 lacks justification comment
• P1 (Codex): Hardcoded shouldUseTransactionDraft(CONST.IOU.ACTION.CREATE,
  CONST.IOU.TYPE.REQUEST)
• Magic number style values should use named constants

[jakubkalinski0]

This topic should be taken into account and discussed when resolving this issue a471d44#r2857231314

Full context

• issue:

• change and discussion:

[DylanDylann]

Not overdue