Improve @overload error message to include host function name

[Copilot]

TS7012 for JSDoc @overload tags didn't include the host function name, making it less actionable than the equivalent TypeScript overload error.

Before: This overload implicitly returns the type 'any' because it lacks a return type annotation.
After: This overload of 'id' lacks a return-type annotation and implicitly has an 'any' return type.

Changes

• extraDiagnosticMessages.json: Overrides TS submodule code 7012 with a two-parameter format "This overload of '{0}' lacks a return-type annotation and implicitly has an '{1}' return type." — the extra messages file takes precedence over the submodule during generation.
• diagnostics_generated.go: Regenerated; old This_overload_implicitly_returns_the_type_0_... replaced by This_overload_of_0_lacks_a_return_type_annotation_and_implicitly_has_an_1_return_type.
• checker.go: At the NodeFlagsReparsed branch (reparsed @overload synthetic function declarations), passes DeclarationNameToString(GetNameOfDeclaration(declaration)) as {0} and the widened type as {1}. The name is always non-nil at this point since anonymous declarations are handled by the earlier Name() == nil guard.
• Baselines: Updated jsFileMethodOverloads3 and templateInsideCallback baselines; added jsFileMethodOverloads3.errors.txt.diff to record the intentional divergence from the upstream TS submodule baseline.

/**
 * @overload
 * @param {number} x
 */
/**
 * @overload
 * @param {string} x
 */
function id(x) { return x; }
// error TS7012: This overload of 'id' lacks a return-type annotation and implicitly has an 'any' return type.