chore: clean up unused imports and variables #313

Job	Run time
Security Audit	3m 8s
Lint	42s
Unit Tests	1m 1s
Check (x86_64-apple-darwin, default)	3m 46s
Check (armv7-unknown-linux-gnueabihf, no-default)	4m 4s
Check (x86_64-unknown-linux-gnu, default)	2m 34s
Check (aarch64-apple-darwin, default)	3m 53s
Check (aarch64-unknown-linux-gnu, no-default)	3m 55s
Check (x86_64-unknown-linux-gnu, full)	3m 36s
Check (x86_64-unknown-linux-gnu, no-default)	2m 59s
Check (x86_64-pc-windows-msvc, default)	11m 37s
Check (aarch64-unknown-linux-gnu, web-tools)	4m 2s
Check (x86_64-pc-windows-msvc, no-default)	11m 49s
E2E Tests	6m 1s
Integration Tests	51s
Build (${{ matrix.target }})	0s
	1h 3m 58s

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