What?

Closes #56402

This PR ensures that the rendering of border color and border width controls in the BorderControl component correctly reflects their respective settings.border.color and settings.border.width values.

Why?

Currently, the border UI in the editor shows both the color and width controls if either settings.border.color or settings.border.width is set to true in theme.json. This makes it impossible to:

• Show only the color picker while keeping width fixed via default.
• Show only the width input while disabling color control.

This behavior does not respect individual border settings and limits theme authors to control over the UI.

How?

• Introduced new attributes showColorControl and showWidthControl in BorderControl and BorderBoxControl.
• Updated the BorderPanel logic to pass these attributes based on the setting in theme.json.
• Conditionally render the border controls based on these attributes.

Testing Instructions

1. Create a theme or modify your theme.json:

{
  "settings": {
    "border": {
      "color": true,
      "width": false
    }
  }
}

2. Open the block editor, insert a block that supports borders (e.g., Group).
3. Go to the block settings and scroll down to the border settings.
4. ✅ You should now only see the color picker (not the width input).
5. Change theme.json to:

{
  "settings": {
    "border": {
      "color": false,
      "width": true
    }
  }
}

5. ✅ Reload the editor, now only the width input should appear.
6. If both color and width are true, both controls should appear as before.

Screenshots or screencast

Setting/View	Linked	Unlinked
Default
Only Color
Only Width