chore(Android, Stack v5): update showAsAction test with icon configuration

[kligarski]

Description

Adds icon configuration to showAsAction test. This is a follow-up to #4101 and #4105.

Note

The bug with orientation changes described in #4101 (comment) is still present. This doesn't impact the test added in this PR and will be handled separately.

Changes

• add option to change icon for menu items
• update scenario

Visual documentation

Screen_recording_20260622_115145.mp4

Test plan

Run test-stack-toolbar-menu-show-as-action-android.

Checklist

• Included code example that can be used to test this change.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• Ensured that CI passes

[Copilot]

Pull request overview

Updates the Android Stack v5 single-feature test for showAsAction to also exercise menu item icon configuration, making the WITH_TEXT variants verifiable and expanding the manual scenario accordingly.

Changes:

• Added icon selection for toolbar menu items in the showAsAction SFT UI (props path + command path).
• Expanded the test scenario markdown to cover icon/overflow behavior and WITH_TEXT visual differences.

Reviewed changes

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

File	Description
apps/src/tests/single-feature-tests/stack-v5/test-stack-toolbar-menu-show-as-action-android/scenario.md	Updates manual test steps/notes to include icon interactions and WITH_TEXT verification.
apps/src/tests/single-feature-tests/stack-v5/test-stack-toolbar-menu-show-as-action-android/index.tsx	Adds icon options to slot configuration and to setToolbarMenuItemOptions command inputs.

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