net/mail: comments in display names are incorrectly handled [1.22 backport]

[gopherbot]

@neild requested issue #65083 to be considered for backport to the next 1.22 minor release.

@gopherbot please open backport issues, this is a PUBLIC track security fix

[gopherbot]

Change https://go.dev/cl/566215 mentions this issue: [release-branch.go1.22] net/mail: properly handle special characters in phrase and obs-phrase

[gopherbot]

Closed by merging 5330cd2 to release-branch.go1.22.