fix(amazonq): fix view summary button

[dhasani23]

Problem

View Summary button wasn't working after users accept changes, since we save the summary.md to where their project is locally.

Solution

Update summary file path.

---

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• Your code changes must meet the guidelines in CONTRIBUTING.md.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.

[jpinkney-aws]

can we write a test to verify this functionality works? Or update an e2e test?

[dhasani23]

We already have this covered here:

aws-toolkit-vscode/packages/amazonq/test/e2e/amazonq/transformByQ.test.ts

Lines 164 to 181 in 6ce9dca

	transformByQState.setSummaryFilePath(path.join(tmpDir, 'summary.md'))
	transformByQState
	.getChatMessenger()
	?.sendJobFinishedMessage(tab.tabID, CodeWhispererConstants.viewProposedChangesChatMessage)
	tab.clickCustomFormButton({
	id: 'gumbyViewSummary',
	text: 'View summary',
	})
	await tab.waitForEvent(() => tab.getChatItems().length > 14, {
	waitTimeoutInMs: 5000,
	waitIntervalInMs: 1000,
	})
	const viewSummaryChatItem = tab.getChatItems().pop()
	assert.strictEqual(viewSummaryChatItem?.body?.includes('view a summary'), true)