fix(menu): prevent overlay close

[AndreiBaicu26]

Description

Noticed that submenus close when they have a switch inside a custom sp-menu-item. This fix prevents the overlay of the submenu from closing when the user tries to enter the submenu via Tab key.

Motivation and context

In express, we need to have a toggle inside a submenu. TOo have full accessibility support over this control we need to allow the user to reach the toggles inside the submenu and select/deselect them.

Related issue(s)

• fixes [Issue Number]

Screenshots (if appropriate)

BEFORE
https://github.com/user-attachments/assets/fd89adb7-5199-4bb4-b2a2-3aa83c38b8d1

AFTER
https://github.com/user-attachments/assets/6eab09de-973a-42f0-9ad2-1810a83eeb2c

TESTED MARKUP

<sp-menu style="width: 200px;">
     <sp-menu-item>
        Test
     </sp-menu-item>
     <sp-menu-item>
        Item with arbitrary content in submenu
        <div role="menuitem" slot="submenu" style="padding: 12px">
              <sp-switch>Hello</sp-switch>
             <sp-switch>Hello</sp-switch>
       </div>
    </sp-menu-item>
     <sp-menu-item>
        Item with arbitrary content in submenu
        <div role="menuitem" slot="submenu" style="padding: 12px">
            <sp-button>TEST</sp-button>
            <sp-button>TEST</sp-button
             <sp-switch>Hello</sp-switch>
        </div>
    </sp-menu-item>
      <sp-menu-item>
             Test
        </sp-menu-item>
         <sp-menu-item>
            Test
        </sp-menu-item>
</sp-menu>

---

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

---

Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

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Latest commit: 66b14fb

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