As a user, I can filter Test Runs on the Test Evolution gadget based on the last past days

As a user, I can filter Test Runs on the Test Evolution gadget based on the last past days.

An additional option for the Date Range => Time frame shall be added entitled "Last days".

ACs:

• if "Time Frame" => "Last Days" is chosen, then the user must select the number of days (6 by default), which must be a non-negative number >= 0; choosing "6" means that Xray will consider Test Runs from the last 6 days (excluding today, whose inclusion is implicit); choosing 0 will only consider Test Runs from today