fix(autocomplete): marking element as touched too early when clicking on options

[crisbeto]

Currently we mark the autocomplete's CVA as touched on each blur event, which can happen a little too early if the user holds their pointer while clicking on an item, causing the form validation to show up too early. These changes defer marking the element as touched until the panel has closed.

Fixes #13732.

[ngbot[bot]]

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[francesconi]

Is there any news?