[bisq-network/bisq] inject clock for usage in isDateInTolerance (#3037)

[Christoph Sturm]

i have a different PR that adds unit tests for the `SignedWitness` class. once this is merged i will use the clock for more unit testing. I just wanted to do the clock injection in a separate pr to make prs small and easy to review and not block a bigger pr if someone has an objection. 

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