Remove "disable_widget_responses" feature flag

Vasilii Iakliushinrequested to merge
521327-remove-ff into master

What does this MR do and why?

Contributes to #537451 (closed)

Feature flag is enabled by default since %18.0 - Enable `disable_widget_responses` by default (!189189 - merged)

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Edited by Vasilii Iakliushin

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