Fix accessibility issue: Hide decorative copy success glyph from screen reader navigation

[Copilot]

Fixes an accessibility issue where screen readers would navigate to a decorative copy button image and stay mute, violating Microsoft Accessibility Guidelines (MAS 4.2.1 - Object Information).

Problem

When users navigate with screen reader keyboard navigation (caps + arrow keys) in the Resources page, the narrator focus would land on the decorative success checkmark glyph of the copy button. This caused the narrator to stay silent, creating an "Uncomprehended Element" trap for users with visual impairments.

Solution

Added AutomationProperties.AccessibilityView="Raw" to the success checkmark FontIcon in the CopyButton template. This attribute hides the decorative element from the accessibility tree while preserving the main copy button's accessibility.

Technical Details

• The main copy button remains fully accessible with AutomationProperties.Name="Copy to clipboard"
• The button properly announces "Copied to clipboard" when activated
• Only the decorative success glyph () is hidden from screen reader navigation
• The copy icon () remains accessible as the button's main content

This is a minimal, surgical fix that addresses the specific accessibility violation without affecting the button's functionality or visual appearance.

Fixes #1964.

Warning

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• e7bvsblobprodcus348.vsblob.vsassets.io
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[marcelwgn]

/azp run