Dropdown fields open / close overlay inconsistently on label click

[web-padawan]

Describe your motivation

Originally reported in #7812 (comment) but that issue was related to focus / blur and this one is about opened state.

Currently, our field components work differently on label click since they have different logic:

ComboBox

• Opens overlay on label element click
• Closes on subsequent label click ("outside click" logic applies) and then re-opens immediately

combo-label-click.mp4

DatePicker

• Opens overlay on label element click
• Doesn't close on subsequent label click (as the vaadin-overlay-close on outside click is prevented)

date-picker-label-click.mp4

TimePicker & MultiSelectComboBox

• Doesn't open overlay on label element click
• Closes on label click when opened ("outside click" logic applies)

time-picker-label-click.mp4

Select

• Opens overlay on label element click
• Closes overlay on subsequent label click

select-label-click.mp4

Describe the solution you'd like

IMO we should consider aligning components to behave either like DatePicker or like Select.