Disabled: Suppress contentEditable warning in story

[tyxla]

What?

Fixes a warning in the Disabled story.

Why?

The behavior in the story is intentional, so the warning is not necessary.

Found while working on #67574.

How?

We're adding the suppressContentEditableWarning prop to intentionally suppress the warning React generates.

Testing Instructions

• Open the Disabled story: http://localhost:50240/?path=/story/components-disabled--content-editable
• Verify the warning no longer appears

Testing Instructions for Keyboard

Same

Screenshots or screencast

Warning before this PR:

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Co-authored-by: tyxla <tyxla@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

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[Mamaduka]

TIL about suppressContentEditableWarning.