fix: Implement support for appending Object and List variants in VariantBuilder #7735
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Which issue does this PR close?
Closes #7701 .
Rationale for this change
The VariantBuilder::append_value method did not support appending
ObjectandListvariants correctly. This PR ensures that these complex types are appropriately copied and appended.What changes are included in this PR?
Are there any user-facing changes?
No