fix: wrong hook on SQL operator GenericTransfer

[ghost]

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Here is the implementation for the reported bug closes: #49731

[boring-cyborg]

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[dabla]

@Baptistouille Thx for the fix, but I think it's best we add an assertion on the invoked hooks (e.g. source/destination) as well to avoid mistakes in the future as well. You can add the assertion of the test_paginated_read method in test_generic_transfer.

[ghost]

@dabla Thanks for pointing out tests.
I made a proposal to cover not paginated case that wasn't. And updated yours to check that the right hooks' methods has been called in case of paginated execution.

[eladkal]

Fixed in #50598