chore: exclude test helpers from coverage

Author: tstephen-nhs

vitest.default.config.ts

@@ -6,7 +6,7 @@ const vitestConfig = defineConfig({
   test: {
     clearMocks: true,
     environment: "node",
-    include: ["tests/**/*.test.ts"],
+    include: ["tests/**/*.test.ts", "tests/**/testHelpers.ts", "tests/**/testUtils.ts"],
     coverage: {
       provider: "v8",
       reportsDirectory: "coverage",