Fix(Table): Correct column reorder drag logic in RTL mode

[O2sa]

Related Issue

Closes #19312

Description

This PR fixes the column reordering logic when the document direction is RTL.

The Problem:
The onColumnDragEnter method calculated dropPosition based solely on LTR assumptions:

• pageX > columnCenter (Right Half) always meant dropPosition = 1 (After).
• In RTL, the "Next" logical slot is to the left, and the "Previous" slot is to the right.

The Fix:

1. Added detection for getComputedStyle().direction === 'rtl'.
2. Inverted the dropPosition logic in RTL:
   • Right Half: Now sets dropPosition = -1 (Before).
   • Left Half: Now sets dropPosition = 1 (After).
3. Adjusted the arrow indicator (reorderIndicatorUp/Down) positioning:
   • Correctly calculates style.left based on the physical edge (Left vs. Right) corresponding to the logical "Before/After" position in the current text direction.

Scope

• Modified Component: Table (specifically onColumnDragEnter).
• Breaking Changes: No.
• Behavioral Changes:
  • RTL: Drag-and-drop reordering now intuitively matches the visual cursor position.
  • LTR: No change to existing behavior.

Visual Proof / Reproduction

Tested in RTL mode:

• Dragging a column to the right side of a target now correctly shows the indicator on the right edge (Before).
• Dragging a column to the left side of a target now correctly shows the indicator on the left edge (After).

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