Replace usage of ConfigFlags.Input.InitialTimeStamp with ConfigFlags.Input.TimeStamp

John Derek Chapmanrequested to merge
jchapman/athena:EvgenCAServices_Fix_master into master

A large number of tests were adding a new Input.InitialTimeStamp flag and using that in the configuration of the McEventSelector replaced this with usage of the existing Input.TimeStamp flag for consistency.

This should fix the unit test failures that appeared as a result of !45619 (merged) being merged.

FYI @wlampl

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