test(igxGrid): Add test for actionstrip outlet when added post-init

[Copilot]

Added test coverage for the scenario where an actionstrip is added to a grid after initialization, verifying that the menuOverlaySettings.outlet is correctly set to the grid's outlet.

Changes

• Test component: GridDynamicActionStripComponent with conditional actionstrip rendering
• Test case: Validates outlet assignment when actionstrip is added dynamically via @if directive

The test ensures the fix for dynamically added actionstrips (where actionStripComponents.changes subscription sets the outlet) works correctly.

// Component starts without actionstrip
expect(grid.actionStrip).toBeUndefined();

// Actionstrip added dynamically
fixture.componentInstance.showActionStrip = true;
fixture.detectChanges();

// Outlet is properly assigned
expect(actionStrip.menuOverlaySettings.outlet).toBe(grid.outlet);

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