Rework DCS point classes to have default assign operators

[ktf]

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• -> Rework DCS point classes to have default assign operators #15240
• Use default constructor #15239

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[ktf]

@vascobarroso who is actually responsible for this?

[ktf]

Discussed with @shahor02 and @vascobarroso given the PR does not change the ABI, we are merging it. A separate discussion with the DCS people will be done to understand if the actual class cannot be improved for the reconstruction / calibration needs.