Go: Rename "named type" to "defined type"

[owen-mc]

No description provided.

[Copilot]

PR Overview

This pull request refactors terminology by replacing references to "named type" with "defined type" throughout the codebase and documentation. Key changes include updated change notes, modified error messages, updated comment texts and labels in type extraction logic, and corresponding updates in database schema definitions.

Changes

File	Description
go/ql/lib/change-notes/2025-02-12-deprecate-namedtype.md	Updates change notes to deprecate NamedType in favor of DefinedType
go/extractor/extractor.go	Updates comments, error messages, and logic to use DefinedType instead of NamedType
go/extractor/dbscheme/tables.go	Renames tables and updates comments from NamedType to DefinedType
go/extractor/trap/labels.go	Updates variable names and function logic to reflect DefinedType

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[mbg]

Broadly looks good. I only have a couple of comments.

I initially thought that maybe cases where we change which class another extends from (e.g. ComparableType) might be a breaking change, but I think you avoided that by keeping NamedType around as an alias for DefinedType. Just noting that here for reference.

[owen-mc]

@mbg Thanks for catching the unedited upgrade scripts - I had to regenerate them and forgot to fix them. I've updated the comment too.

I also ran DCA, just in case I messed something up when updating the stats file, and it showed no significant variation in anything.

[mbg]

All looks good to me now!