LPD-31398 Fix API Headless filters edition

[liferay-continuous-integration]

Forwarded from: https://github.com/liferay-frontend/liferay-portal/pull/4328 (Took 2 ci:forward attempts in 1 hour 26 minutes) Console

@dsanz @liferay-frontend

Original pull request comment: This is a followup of https://github.com/liferay-frontend/liferay-portal/pull/4324 where:

• ApiRestApplication component manages its own internal state considiering the existence of an existing filter for edition.
• Such component informs the general SelectionFilter component when such state changes, even in the initial edition of an existing filter
• We also fix some minor errors we found down the line to improve robustness and UX