qblox backend: configuration update for QCM

[RJQblox]

This fix is needed since the NCO propagation delay is only available for readout modules (QRM), but not control modules (QCM). Both the src/qat/backend/qblox and src/purr/cat/backends/qblox folder have been updated, is this correct?

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[helmaazouz-oqc]

Thank you @RJQblox for the suggested changes ! When it comes to configuration, QBlox have fine-grained APIs for numerous settings, we've grouped NCO related ones exactly to avoid fine-grained methods. But you still have several subtypes of QBloxConfigHelper for the purposes you mentioned, I encourage you to override nco there with the sequence of changes you like (excluding prop delay)