Expand sheet string

[nodes11]

Platforms Impacted

• iOS
• visionOS
• macOS

Description of changes

We have an internal request to use a more verbose string for the bottom sheet controller resizing handle accessibility label so that the user knows what is being expanded or collapsed.

Previously, the accessibility label would just read "Expand" or "Collapse". Now the accessibility label will read "Expand Sheet" or "Collapse Sheet".

Binary change

(how is our binary size impacted -- see https://github.com/microsoft/fluentui-apple/wiki/Size-Comparison)

Verification

• On iPhone, validated that new strings are used when VoiceOver is ON.
• Using simulator and Accessibility Inspector, validated that the accessibility label is set as expected.

Visual Verification

Before	After

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Pull request checklist

This PR has considered:

• Light and Dark appearances
• iOS supported versions (all major versions greater than or equal current target deployment version)
• VoiceOver and Keyboard Accessibility
• Internationalization and Right to Left layouts
• Different resolutions (1x, 2x, 3x)
• Size classes and window sizes (iPhone vs iPad, notched devices, multitasking, different window sizes, etc)
• iPad Pointer interaction
• SwiftUI consumption (validation or new demo scenarios needed)
• Objective-C exposure (provide it only if needed)

Microsoft Reviewers: Open in CodeFlow