fix: env dropdown error - [INS-4551]

[CurryYangxx]

Fix the error when clicking the environment dropdown.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: packages/insomnia/src/ui/routes/environments.tsx

Function	Unhandled Issue
Environments	ReferenceError: debouncedHandle is not defined /i... Event Count: 1 Affected Users: 0

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