Make NodePIDs threadsafe

• use SynchronizedValue to protect access to list of accepted/rejected particles
• adapt code accordingly
• add copy construction and assignment op to SynchronizedValue to simplify client code

must be applied in conjunction with Phys!974 (merged)

added thread safety label

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• 24950455 - Make NodePIDs threadsafe

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mentioned in commit Phys@b796cdc5

mentioned in merge request Phys!974 (merged)

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mentioned in commit Phys@d5aeae73

mentioned in merge request !3172 (closed)

@lmeyerga: FYI

/ci-test --merge Phys!974 (merged)

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• [2021-08-05 12:44] Validation started with lhcb-master-mr#2668

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• 86d05aa9 - add copy ctor and assignment to SynchronizedValue

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• 9f2cebbc - add copy ctor and assignment to SynchronizedValue

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• df5e0f4b - add copy ctor and assignment to SynchronizedValue

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• 6958c92e - add copy ctor and assignment to SynchronizedValue

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• 6958c92e...bfca36c4 - 4 commits from branch master
• 4f78b8c6 - Make NodePIDs threadsafe
• a1b9c2ad - add copy ctor and assignment to SynchronizedValue

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