Update a11y-link-in-text-block rule to include HTML anchor elements

[Copilot]

This PR adds support for detecting HTML anchor elements (<a>) in text blocks to the existing a11y-link-in-text-block rule. The rule now recommends converting HTML anchors to Link components from @primer/react for consistent styling and accessibility.

Changes

• Enhanced the rule to detect HTML anchor elements within text blocks
• Added autofix functionality to automatically replace HTML anchors with Link components
• Updated documentation to include information about the new HTML anchor check
• Added tests to verify the HTML anchor detection and autofix functionality

Examples

Before (Flagged by this rule):

<p>Please <a href="https://github.com">visit our site</a> for more information.</p>

After autofix:

<p>Please <Link href="https://github.com">visit our site</Link> for more information.</p>

Similar to the existing check for Link components, the rule skips certain cases to avoid false positives:

• Anchor elements with a className attribute
• Anchor elements with JSX element children
• Anchor elements in headings
• Anchor elements where the only adjacent text is a period

Fixes #344.

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