fix(coverage): ignore `*.cts` files #10554

Job	Run time
lint	54s
test-browser-windows (chrome, chromium)	6m 1s
test-browser (chrome, chromium)	3m 25s
test-browser-windows (edge, webkit)	6m 19s
test (ubuntu-latest, 18)	7m 2s
test-browser (firefox, firefox)	4m 52s
test (ubuntu-latest, 20.14)	6m 52s
test-browser (edge, webkit)	4m 14s
test-ui (ubuntu-latest)	2m 0s
test (macos-14, 20.14)	5m 52s
test-ui (macos-14)	1m 57s
test (windows-latest, 20.14)	9m 22s
test-ui (windows-latest)	3m 20s
	1h 2m 10s

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