v8.0.0-rc.14-dev.15: Close the PSL binder project (#30566)

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Linked issue Closes out #30349 (binder), #30478 (SQL), #30538 (Mongo), and #30545 (language server). Linear tracking was explicitly omitted. Summary Add the already-emitted PSL_UNRESOLVED_REFERENCE code to PslDiagnosticCode , with a type regression test. Remove the completed project's temporary files. Documentation changes correct outdated API signatures, removed helpers, namespace behavior, diagnostic shapes, and d…

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