fix(core): allow users to specify createdAt in updateOnDuplicate

[LJ1102]

Fixes issue #17347

Pull Request Checklist

• Have you added new tests to prevent regressions?
• If a documentation update is necessary, have you opened a PR to the documentation repository?
• Did you update the typescript typings accordingly (if applicable)?
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Description of Changes

Allows to provide createdAt field in updateOnDuplicate option to enable updating the createdAt timestamp on duplicate. In older versions (<2018) it was possible to provide a boolean to enable all fields to be updated on duplicate, however this behavior is not supported anymore and users need to explicitly provide a list of field names allowing finer grained control over what's updated. The explicit exclusion of createdAt is thus no longer necessary and simply a remainder of the old, removed functionality.

List of Breaking Changes