LPS-42402 Use right plid to obtain the date range
LPS-42402 Read last publish date from strict portlet setup.

Last publish date is currently stored in the strict portlet setup, so it should also be read from them.
LPS-42402 Move common lastPublishDate logic to util method
LPS-42402 Make portlet lastPublishDate logic consistent with layouts
LPS-42402 Test update portlet lastPublishDate
LPS-42402 SF