Fix eslint rule typo: backgroundDismiss → backdropDismiss

[Copilot]

The eslint rule dnn-modal-no-background-dismiss was checking for backgroundDismiss instead of the correct property name backdropDismiss, causing it to never trigger on the deprecated property.

Changes

• Rule implementation: Updated attribute lookup from backgroundDismiss to backdropDismiss and autofix suggestion from preventBackgroundDismiss to preventBackdropDismiss
• Tests: Corrected test cases to use proper property names
• Documentation: Fixed examples to reference correct property names

Example

The rule now correctly detects:

// Before: rule didn't trigger (wrong attribute name)
<dnn-modal backdropDismiss={false}>

// After: rule triggers and autofixes to
<dnn-modal preventBackdropDismiss>

The correct property names match the actual component implementation in dnn-modal.tsx which defines backdropDismiss and preventBackdropDismiss.

Original prompt

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This section details on the original issue you should resolve

<issue_title>eslint plugin typo in backgroundDismiss</issue_title>
<issue_description>The eslint rule/autofix for backdropDismiss is wrong and has backgroundDismiss instead of backdropDismiss</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes eslint plugin typo in backgroundDismiss #1398

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