refactor(ios): uimanager's views relation structure optimization

[wwwcg]

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• Test cases have been added/updated/passed for the code you will submit.
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[hippy-service]

Hi, @wwwcg. Thanks for your PR! 👏

🏷️ You can leave a comment in this PR with #help tag when you need help (e.g. some status checks run failed due to internal issue), admin team members will help asap.