perf: remove unused import from at-focus-controller #10787

Job	Run time
Lint files	35s
Unit Tests (Web Test Runner)	1m 34s
Compile project (22)	1m 4s
SSR Tests (Playwright)	1m 34s
Verify that build runs on Windows	1m 44s
Compile project (24)	1m 5s
Validate successful build on main	4s
Publish Playwright Report	34s
	8m 14s

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