Spacer block: unlabeled Range and Input controls

[afercia]

Description

The Spacer block can be used to add vertical or horizontal spacing.

In both cases, two settings controls are unlabeled. One more case of completely unlabeled controls only because the label prop is not required or used incorrectly. Cc @WordPress/gutenberg-components @joedolson

Vertical spacing:
The range control highlighted in the screenshot below is unlabaled:

Horizontal spacing:
The input field highlighted in the screenshot below is unlabaled:

Step-by-step reproduction instructions

• Add a Row with a paragraph, a spacer block and another paragraph
• Select the spacer.
• Inspect the width input control when the width is set to 'fixed'.
• Observe the input field is not labeled.
• Add a normal Spacer block and select it.
• Inspect the width range control.
• Observe it's not labeled.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes