refactor: removing unused imports/exports #12429
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What does this PR do?
Removes unused imports and exports reported by lgtm alerts
Motivation
Unused local variables make code hard to read and understand. Any computation used to initialize an unused variable is wasted, which may lead to performance problems.
Similarly, unused imports and unused functions or classes can be confusing. They may even be a symptom of a bug caused, for example, by an incomplete refactoring. (https://lgtm.com/rules/1780092/)