test: fail CI on dual-major react-query in RTV [AIS-33]

[Jared Jolton (jjolton-contentful)]

AIS-33

Summary

• Add an install-tree CI gate for Rich Text Versioning that fails when more than one major of @tanstack/react-query is present under node_modules
• Catches the dual-major tree (field-editor-reference hard-deps ^4 vs field-editor-rich-text@6 / field-editor-shared@4 peer-accepting ^4 || ^5) that Vite collapses to the wrong single major at bundle time — the embedded entry/asset card sys crash class
• Unique-majors only (no forced 4.x pin); noted as a sharp edge in AGENTS.md

Test plan

• npm run test:ci in apps/rich-text-versioning (36 tests green, including new gate)
• Unit cases cover empty / single-major / dual-major (4+5) trees
• Live walk of current node_modules asserts a single major
• Confirm lerna --since still marks RTV changed on a package.json / lockfile dep bump so test:ci runs

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