Omit redundant role="heading" on native heading elements

[bencripps]

Fixes #2780.

Text with accessibilityRole="header" (or role="heading") already renders an h1–h6. createDOMProps was also setting role="heading" on that element. An explicit heading role overrides the tag's implicit level, so axe no longer counts it as a real heading (h1[role="heading"]).

Native headings now keep their implicit role. A non-heading host, such as a div, still receives role="heading".

Test plan

• propsToAccessibilityComponent still maps a heading role to h1 / hN
• createDOMProps('h1' | 'h3', …) does not set role
• createDOMProps('div', { role: 'heading' }) still sets role="heading"
• createElement renders <h1> and <h2> with no role attribute
• jest for createDOMProps and createElement (72 tests)

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