Updating evaluation of strip ends for space point formation

This MR improves the execution time of the strip space point formation. I have removed a few CPU consuming calculations in favour of an easier and faster evaluation of the strip index used to evaluate the strip ends. The output stays identical.

@cvarni has already looked at the CPU improvement and can comment more.

Updates are applied to the ActsTrkStripSpacePointFormationTool and ActsCoreStripSpacePointFormationTool. If you are wondering why the code is duplicated, studies are ongoing to asses the CPU performance of the two tools and decide which one needs to be kept.

Tagging: @toyamaza

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