feat(ios): delete JSContext in turbo

[bennyzqliu]

Pre-PR Checklist

• [x] I added/updated relevant documentation.
• [x] I followed the Convention Commit guideline with maximum 72 characters to submit commit message.
• [x] I squashed the repeated code commits.
• [x] I signed the [CLA].
• [x] I added/updated test cases to check the change I am making.
• [x] All existing and new tests are passing.

[tencent-adm]

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