test(amazonq): performance test for hashing file in LSP. (aws#5720)

## Problem
continuation of performance test work:
aws#5670

## Solution
same as previous.
CPU threshold set very high because it spikes pretty wildly on this one.

![image](https://github.com/user-attachments/assets/cc8a6ce9-1be1-4504-b4de-cbafd1241016)


---

<!--- REMINDER: Ensure that your PR meets the guidelines in
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License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: Hweinstock

packages/core/src/testInteg/perf/getFileSha384.test.ts

@@ -0,0 +1,61 @@
+/*!
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import assert from 'assert'
+import path from 'path'
+import { getTestWorkspaceFolder } from '../integrationTestsUtilities'
+import { fs, getRandomString } from '../../shared'
+import { LspController } from '../../amazonq'
+import { performanceTest } from '../../shared/performance/performance'
+
+function performanceTestWrapper(label: string, fileSize: number) {
+    return performanceTest(
+        {
+            testRuns: 1,
+            linux: {
+                userCpuUsage: 400,
+                systemCpuUsage: 35,
+                heapTotal: 4,
+            },
+            darwin: {
+                userCpuUsage: 400,
+                systemCpuUsage: 35,
+                heapTotal: 4,
+            },
+            win32: {
+                userCpuUsage: 400,
+                systemCpuUsage: 35,
+                heapTotal: 4,
+            },
+        },
+        label,
+        function () {
+            return {
+                setup: async () => {
+                    const workspace = getTestWorkspaceFolder()
+                    const fileContent = getRandomString(fileSize)
+                    const testFile = path.join(workspace, 'test-file')
+                    await fs.writeFile(testFile, fileContent)
+
+                    return testFile
+                },
+                execute: async (testFile: string) => {
+                    return await LspController.instance.getFileSha384(testFile)
+                },
+                verify: async (_testFile: string, result: string) => {
+                    assert.strictEqual(result.length, 96)
+                },
+            }
+        }
+    )
+}
+
+describe('getFileSha384', function () {
+    describe('performance tests', function () {
+        performanceTestWrapper('1MB', 1000)
+        performanceTestWrapper('2MB', 2000)
+        performanceTestWrapper('4MB', 4000)
+        performanceTestWrapper('8MB', 8000)
+    })
+})