Delete PixelRadDamDigitization, merge it into PixelDigitization (ATLASSIM-4425)

Soshi Tsunorequested to merge
stsuno/athena:atlassim-4425 into master

The PixelRadDamDigitization is merged into PixelDigitization.

So far, the radiation damage set to be OFF by default. In future it will be activated.

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