fix(tools): add `PfeDemoPage.js` to `package.json` exports #10558

Job	Run time
Lint files	35s
Unit Tests (Web Test Runner)	1m 9s
SSR Tests (Playwright)	1m 21s
Compile project (22)	53s
Compile project (24)	49s
Verify that build runs on Windows	1m 30s
Validate successful build on main	3s
Publish Playwright Report	27s
	6m 47s

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