API integration

Description	Ticket	Severity
The Studies GET call resulted in a timeout error or other intermittent errors.	CHK-46476	4
In Milestone Publish messages, system dates (e.g., updated_at) were not in the expected YYYY-MM-DDTHH:MM:SS.MSS-UTCoffset date time format. We corrected this issue and Milestone Publish messages now use ISO date time format. Note that this correction also updated Activity Change messages to ISO date time format.	CHK-46487	2
Intermittently, response time for Artifacts GET messages was longer than expected and could result in timeout errors.	CHK-46514	3