Bug 573409 - test for [performance] Avoid File.getCanonicalPath

additional tests for case insensitive edge cases of copy and move

Change-Id: Iaca9da595f1eaf5072cd9af61c5540f68a4471d1
Signed-off-by: Joerg Kubitz <jkubitz-eclipse@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.resources/+/180307
Tested-by: Lars Vogel <Lars.Vogel@vogella.com>
Reviewed-by: Lars Vogel <Lars.Vogel@vogella.com>
Reviewed-by: Sebastian Ratz <sebastian.ratz@sap.com>