fix: menuitem: added containerRole prop to menu item components

[sthakur-c-2-eightfold]

SUMMARY:

Adds containerRole support to Menu Items to improve semantic structure and accessibility:

• Adds containerRole prop to MenuItemButton, MenuItemLink, MenuItemCustom, and MenuItemSubHeader components
• Enables custom role assignment for menu item container elements
• Improves semantic structure of menu items for better accessibility
• Maintains consistency across different menu item types

GITHUB ISSUE (Open Source Contributors)

NA

JIRA TASK (Eightfold Employees Only):

https://eightfoldai.atlassian.net/browse/ENG-99021

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

1. Verify containerRole prop is properly applied to all menu item types
2. Test different role values for menu item containers
3. Check ARIA attributes and roles are correctly rendered
4. Verify existing menu functionality remains intact

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