Fix errors in 'build' script directory (#20004)

* Update build scripts

* Update build files

* fix build errors

build/lib/treeshaking.ts

@@ -245,6 +245,14 @@ class TypeScriptLanguageServiceHost implements ts.LanguageServiceHost {
 		this._compilerOptions = compilerOptions;
 	}
 
+	// {{SQL CARBON EDIT}} - provide missing methods
+	readFile(): string | undefined {
+		return undefined;
+	}
+	fileExists(): boolean {
+		return false;
+	}
+
 	// --- language service host ---------------
 
 	getCompilationSettings(): ts.CompilerOptions {