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refactor: Drop util::Result operator=
`util::Result` objects are aggregates that can hold multiple fields with different information. Currently Result objects can only hold a success value of an arbitrary type or a single bilingual_str error message. In followup PR #25722, Result objects may be able to hold both success and failure values of different types, plus error and warning messages. Having a Result::operator= assignment operator that completely erases all existing Result information before assigning new information is potentially dangerous in this case. For example, code that looks like it is assigning a warning value could erase previously-assigned success or failure values. Conversely, code that looks like it is just assigning a success or failure value could erase previously assigned error and warning messages. To prevent potential bugs like this, disable Result::operator= assignment operator. It is possible in the future we may want to re-enable operator= in limited cases (such as when implicit conversions are not used) or add a Replace() or Reset() method that mimicks default operator= behavior. Followup PR #25722 also adds a Result::Update() method providing another way to update an existing Result object. Co-authored-by: stickies-v <stickies-v@protonmail.com>
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