[V2 ListItem] Add Token for Modifying Text Overflow in ListItem Item and Header

[Dhruv-Mishra]

Changes

Added ability to change the Text Overflow for ListItem.Item and Header, through tokens.
Requested in #785

Screenshots

Before (Default using TextOverflow.Ellipsis	After (UsingTextOverflow.Clip)

Pull request checklist

This PR has considered:

• Light and Dark appearances
• Automated Tests
• Documentation and demo app examples
• VoiceOver and Keyboard Accessibility
• Internationalization and RTL layouts
• Size classes and window sizes (notched devices, multitasking, different window sizes, etc)

[Copilot]

Pull Request Overview

This PR adds tokenization support for modifying the text overflow behavior in ListItem.Item and Header components, providing flexibility to change the default ellipsis behavior.

• Introduces a new token method textOverflow in ListItemTokens.kt.
• Updates ListItem.kt to utilize token.textOverflow in multiple UI elements instead of the hard-coded TextOverflow.Ellipsis.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
fluentui_listitem/src/main/java/com/microsoft/fluentui/tokenized/listitem/ListItem.kt	Replaces fixed TextOverflow.Ellipsis with a token-based overflow value in various text components
fluentui_core/src/main/java/com/microsoft/fluentui/theme/token/controlTokens/ListItemTokens.kt	Adds a new textOverflow token returning TextOverflow.Clip

Comments suppressed due to low confidence (1)

fluentui_listitem/src/main/java/com/microsoft/fluentui/tokenized/listitem/ListItem.kt:1042

• The use of a fallback default (TextOverflow.Ellipsis) here is inconsistent with other instances where token.textOverflow is used directly. Consider standardizing by either always relying on the token's return value or providing a fallback consistently across all usages.

        val textOverflow = token.textOverflow(listItemInfo) ?: TextOverflow.Ellipsis