Disallow duplicate phase entries

[Kronos3]

We should disallow duplicate entries of the same phase number in component instance specifiers.

For example:

instance rateGroupDriver: Svc.RateGroupDriver base id FixedBaseIds.NO_DICTIONARY \
  {
    phase Fpp.ToCpp.Phases.configConstants """
    // The reference topology divides the incoming clock signal 10Hz
    Svc::RateGroupDriver::DividerSet rateGroupDivisors{{{1, 0}, {10, 0}, {100, 0}}};
    """

    phase Fpp.ToCpp.Phases.configConstants """
    // Rate group driver needs a divisor list
    rateGroupDriver.configure(rateGroupDivisors);
    """
  }

This was a bug I had where I had duplicate entries of configConstants, the second entry should have been configComponents. It made it to C++ and gave be an odd (which wasn't very odd once I saw this typo) error about rateGroupDivisors being undefined. I think it would be reasonable to catch this at FPP-time.