[date-time-picker] Invalid state not reset when setting required property to false

[web-padawan]

Description

Unlike individual pickers, vaadin-date-time-picker doesn't reset invalid to false when required is unset.

Interestingly, the invalid is reset on vaadin-date-picker in this case leaving the field in a weird state:

Expected outcome

Expected the field to become valid if value isn't provided when setting required to false.

Minimal reproducible example

<vaadin-date-time-picker
  label="Appointment date and time"
  required
  error-message="This field is required"
></vaadin-date-time-picker>

<script type="module">
  import '@vaadin/date-time-picker';
</script>

Steps to reproduce

1. Add the snippet above to the HTML page
2. Focus the date-picker
3. Press Tab to focus time-picker
4. Press Tab once again
5. Set required to false in the console

Environment

Vaadin version(s): V24, V23

Browsers

Issue is not browser related