Move check for presence of the phone strip function to a Check (currently done whenever a phone number is edited)

Note I think this is fairly clear cut but would appreciate some +1s before starting on it

mentioned in issue #65 (closed)

added needs:concept approval triaged type:proposal labels

mentioned in issue #97 (closed)

mentioned in issue #339 (closed)

mentioned in issue #613 (closed)

mentioned in issue #723 (closed)

mentioned in issue #978 (closed)

mentioned in issue #1015 (closed)

mentioned in issue #1183 (closed)

mentioned in issue #2089 (closed)

mentioned in issue #2377 (closed)

removed needs:concept approval label

+1 from me (better late than never)

closed

changed milestone to %5.40.0

mentioned in commit 0cc5d8f5

mentioned in issue #3698 (closed)

mentioned in issue #4267

mentioned in issue #5284 (closed)