[clang][ssaf] Improve serialization for Model types and error messages in `JSONFormat` This changes fixes the diagnostic infrastructure in `JSONFormat` implementation to pass model objects (`EntityId`, `EntityLinkage`, `BuildNamespace`, `NestedBuildNamespace`, `SummaryName`) directly to `ErrorBuilder` instead of manually extracting their components. This relies on existing `llvm::format_provider` specializations for these objects. To support consistent string conversion for `BuildNamespaceKind` and `EntityLinkageType`, across both serialization and `operator<<`, `toString`/`fromString` functions have been introduced in an internal header `ModelStringConversions.h`. `EntityLinkage::LinkageType` is promoted to a standalone enum class `EntityLinkageType` at namespace scope, following the same pattern as `BuildNamespaceKind`. Tests have been added for `operator<<` and `format_provider` for all affected types, and a new `ModelStringConversionsTest.cpp` directly unit-tests the `toString/fromString` functions including round-trip and unknown-input cases.
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