DropdownMenuV2: break menu item help text on multiple lines for better truncation

[ciampo]

What?

Allow menu item help text in DropdownMenuV2 to break more deliberately to avoid unexpected un-truncated text

Why?

Because otherwise a menu item's help text could not be truncated in case its contents don't break to a new line

How?

By adding word-break: break all

Testing Instructions

Apply the following changes to the component's Storybook example:

diff --git a/packages/components/src/dropdown-menu-v2/stories/index.story.tsx b/packages/components/src/dropdown-menu-v2/stories/index.story.tsx
index a2fc476cd8..3ddb269c6d 100644
--- a/packages/components/src/dropdown-menu-v2/stories/index.story.tsx
+++ b/packages/components/src/dropdown-menu-v2/stories/index.story.tsx
@@ -78,10 +78,11 @@ export const Default: StoryFn< typeof DropdownMenu > = ( props ) => (
 			<DropdownMenuItemHelpText>Help text</DropdownMenuItemHelpText>
 		</DropdownMenuItem>
 		<DropdownMenuItem>
-			<DropdownMenuItemLabel>Label</DropdownMenuItemLabel>
+			<DropdownMenuItemLabel>
+				https://m.media-amazon.com/images/M/MV5BOTI5ZTNkYWQtNDg2Mi00MTBmLTliMGItNTI5YWI5OTZkM2Y2XkEyXkFqcGdeQXVyNzU1NzE3NTg@._V1_QL75_UX500_CR0,47,500,281_.jpg
+			</DropdownMenuItemLabel>
 			<DropdownMenuItemHelpText>
-				The menu item help text is automatically truncated when there
-				are more than two lines of text
+				https://m.media-amazon.com/images/M/MV5BOTI5ZTNkYWQtNDg2Mi00MTBmLTliMGItNTI5YWI5OTZkM2Y2XkEyXkFqcGdeQXVyNzU1NzE3NTg@._V1_QL75_UX500_CR0,47,500,281_.jpg
 			</DropdownMenuItemHelpText>
 		</DropdownMenuItem>
 		<DropdownMenuItem hideOnClick={ false }>

2. On trunk, notice how the help text would cause the menu to scroll horizontally, since the text can't be correctly truncated
3. On this PR's branch, notice how the text gets truncated correctly

Screenshots or screencast

Before (trunk)	After (this PR)

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: ciampo <mciampini@git.wordpress.org>
Co-authored-by: tyxla <tyxla@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[tyxla]

LGTM 👍