fix(tools): add `PfeDemoPage.js` to `package.json` exports #10542

Job	Run time
Unit Tests (Web Test Runner)	1m 15s
SSR Tests (Playwright)	1m 42s
Verify that build runs on Windows	1m 45s
Lint files	40s
Compile project	-1s
Validate successful build on main	7s
Publish Playwright Report	19s
	5m 47s

Provide feedback