test(amazonq): minor test fix (aws#7819)

## Problem
Failing 1 test

## Solution
Fixed it

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
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Apache 2.0 license.

Author: tgodara-aws

packages/core/src/test/amazonqGumby/transformationJobHistory.test.ts

@@ -17,6 +17,7 @@ import nodeFs from 'fs' // eslint-disable-line no-restricted-imports
 import { postTransformationJob } from '../../codewhisperer/commands/startTransformByQ'
 import * as transformApiHandler from '../../codewhisperer/service/transformByQ/transformApiHandler'
 import * as vscode from 'vscode'
+import * as datetime from '../../shared/datetime'
 
 describe('Transformation Job History', function () {
     let transformationHub: TransformationHubViewProvider
@@ -193,6 +194,7 @@ describe('Transformation Job History', function () {
 
             it('Limits history to 10 most recent jobs', async function () {
                 fsExistsStub.resolves(true)
+                sinon.stub(datetime, 'isWithin30Days').returns(true)
 
                 // Create 15 job entries
                 let mockHistoryContent = 'date\tproject_name\tstatus\tduration\tdiff_patch\tsummary\tjob_id\n'