Refactor health check tests and remove unused helpers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Phil Whittaker

src/umb-management-api/tools/health/__tests__/get-health-check-group-by-name.test.ts

@@ -1,5 +1,4 @@
 import GetHealthCheckGroupByNameTool from "../get/get-health-check-group-by-name.js";
-import { HealthTestHelper } from "./helpers/health-test-helper.js";
 import { createSnapshotResult } from "@/test-helpers/create-snapshot-result.js";
 import { jest } from "@jest/globals";
 
@@ -17,7 +16,6 @@ describe("get-health-check-group-by-name", () => {
 
   afterEach(async () => {
     console.error = originalConsoleError;
-    await HealthTestHelper.cleanup();
   });
 
   it("should get health check group by valid name", async () => {

src/umb-management-api/tools/health/__tests__/get-health-check-groups.test.ts

@@ -1,5 +1,4 @@
 import GetHealthCheckGroupsTool from "../get/get-health-check-groups.js";
-import { HealthTestHelper } from "./helpers/health-test-helper.js";
 import { createSnapshotResult } from "@/test-helpers/create-snapshot-result.js";
 import { jest } from "@jest/globals";
 
@@ -16,7 +15,6 @@ describe("get-health-check-groups", () => {
 
   afterEach(async () => {
     console.error = originalConsoleError;
-    await HealthTestHelper.cleanup();
   });
 
   it("should get health check groups", async () => {

src/umb-management-api/tools/health/__tests__/helpers/health-check-action-builder.ts

@@ -1,5 +1,4 @@
 import RunHealthCheckGroupTool from "../post/run-health-check-group.js";
-import { HealthTestHelper } from "./helpers/health-test-helper.js";
 import { postHealthCheckGroupByNameCheckParams } from "@/umb-management-api/umbracoManagementAPI.zod.js";
 import { jest } from "@jest/globals";
 
@@ -16,7 +15,6 @@ describe("run-health-check-group", () => {
 
   afterEach(async () => {
     console.error = originalConsoleError;
-    await HealthTestHelper.cleanup();
   });
 
   it("should validate parameters for valid group name", async () => {