fix(tools): add `PfeDemoPage.js` to `package.json` exports #10559

Job	Run time
Unit Tests (Web Test Runner)	1m 12s
Lint files	39s
Compile project (24)	54s
Compile project (22)	47s
SSR Tests (Playwright)	1m 30s
Verify that build runs on Windows	1m 20s
Validate successful build on main	4s
Publish Playwright Report	30s
	6m 56s

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