test: failing IAMPolicy check test #5714

## Problem
There is a test from recent PR that is incorrect given current
structure. Ex.
https://github.com/aws/aws-toolkit-vscode/actions/runs/11149044046/job/30987024464

Using `globals.context.asAbsolutePath` will prepend `toolkit` to the
path, whereas we want to look in `core` for this file.

## Solution
- Manually construct the path to be checked.

Author: Hweinstock

packages/core/src/test/awsService/accessanalyzer/iamPolicyChecks.test.ts

@@ -19,6 +19,7 @@ import * as iamPolicyChecks from '../../../awsService/accessanalyzer/vue/iamPoli
 import * as vscode from 'vscode'
 import { IamPolicyChecksConstants } from '../../../awsService/accessanalyzer/vue/constants'
 import { FileSystem } from '../../../shared/fs/fs'
+import path from 'path'
 
 const defaultTerraformConfigPath = 'resources/policychecks-tf-default.yaml'
 let sandbox: sinon.SinonSandbox
@@ -29,7 +30,10 @@ describe('iamPolicyChecks', function () {
     it('IamPolicyChecksWebview built .vue source file path exists', async function () {
         assert.ok(
             await vscodeFs.existsFile(
-                globals.context.asAbsolutePath(`src/awsService/accessanalyzer/vue/iamPolicyChecks.vue`)
+                path.join(
+                    path.dirname(globals.context.extensionPath),
+                    `core/src/awsService/accessanalyzer/vue/iamPolicyChecks.vue`
+                )
             )
         )
     })