TagInfoMgr: adding back in getRunNumber for sim jobs

R D Schafferrequested to merge
ATLAS-EGamma/athena:taginfoFixes1 into master

Fix for sim jobs where the TagInfo is retrieved during initialization, before begin run, to resolve magic tags, so adding back in getRunNumber.

Related jira ticket: https://its.cern.ch/jira/browse/ATLASSIM-4714

@jchapman (@tadej you were correct!)

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