IOVSvc: Package cleanup

Frank Winklmeierrequested to merge
fwinkl/athena:iovsvc_cleanup2 into master

Package cleanup of IOVSvc:

  • Move private headers to the src directory
  • Remove duplicate include guards
  • Delete unused IOVSvc.icc
  • Cleanup library dependencies in CMakeLists.txt

This is the same as !24010 (closed) but without making CondInputLoader reentrant until the problems with that change are understood.

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