Feature/654 published date

[TinHoangVu]

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Description

Added gtLastReportDate to statusreport model to show published date and time for published statusreport.
@tarjeieo You need to update the npm package pp365-shared so that we can use the gtLastReportDate field later.
When this is done, i will add the gtLastReportdate field to show published date.

Relevant issues (if applicable)

#654

[olemp]

Ikke ta med feltprefiks i navnet. publishedDate, ikke gtLastReportDate.