Restore APIServerLoadBalancer.Provider on up-conversion

[mdbooth]

From v1alpha6 onwards we have the facility to losslessly preserve values during conversion which were added or removed in the new version, so we should never require the FuzzerFuncs argument to the fuzzer conversion tests.

/hold

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[mdbooth]

@ching-kuo @dulek My apologies, I missed this in review of #1501. In prior api versions we effectively added an exception to the fuzzer tests for values which were added or removed, but as we're now using CAPI's 'previous version' annotation we can now manually restore these values and we don't need this any more.

Incidentally, we might eventually consider retrofitting this to v1alpha5, but it's not worth adding to prior versions.

/cc @lentzi90 @tobiasgiese

[lentzi90]

/lgtm

[mdbooth]

/hold cancel