Implement Portal Logic for UpWindowAngularComponent

[lucasferreiralimax]

This PR introduces the implementation of portal logic to the UpWindowAngularComponent. The portal logic allows the modal window to be rendered dynamically within the document.body, ensuring that it remains visually separate from the component's parent DOM structure and manages focus trapping for accessibility.

Changes Made:

• Introduced addModalToBody and removeModalFromBody methods for managing the lifecycle of the modal window.
• Added focus trap functionality to maintain keyboard navigation within the modal.
• Updated the ngAfterViewInit lifecycle hook to append the modal to document.body.
• Implemented cleanup logic to remove the modal from the DOM upon component destruction (ngOnDestroy).
• Added unit tests to verify that the modal is properly added and removed from the body, and that focus trapping behaves as expected.
• Modified existing unit tests to accommodate the portal functionality.

Testing:

• Unit tests added to ensure the correct behavior of the portal logic and focus management.
• Manual testing to confirm that the modal behaves correctly in terms of opening, closing, and accessibility (focus management).

Screenshots:

[github-actions]

Visit the preview URL for this PR (updated for commit a50c273):

https://up-window-angular--pr13-portal-window-20vn1nh0.web.app

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