fix(PanelHeader): hide separator with transparent PanelHeader #6145

Job	Run time
Run linters	2m 0s
Detect what files changed	6s
Call reusable workflow / Run unit tests	1m 46s
Upload docs dist artifact (styleguide)	2m 8s
Upload docs dist artifact (storybook)	1m 24s
Analyze bundle size	2m 15s
Check dependencies	0s
Call reusable workflow / get_playwright_docker_image	15s
Call reusable workflow / Run e2e tests for (shard 1/10)	2m 13s
Call reusable workflow / Run e2e tests for (shard 2/10)	3m 20s
Call reusable workflow / Run e2e tests for (shard 3/10)	2m 18s
Call reusable workflow / Run e2e tests for (shard 4/10)	2m 43s
Call reusable workflow / Run e2e tests for (shard 5/10)	3m 32s
Call reusable workflow / Run e2e tests for (shard 6/10)	2m 10s
Call reusable workflow / Run e2e tests for (shard 7/10)	3m 12s
Call reusable workflow / Run e2e tests for (shard 8/10)	2m 13s
Call reusable workflow / Run e2e tests for (shard 9/10)	2m 39s
Call reusable workflow / Run e2e tests for (shard 10/10)	3m 14s
Report unit test results	2s
Prepare and upload e2e's HTML report artifact	28s
Call reusable workflow / Upload PR workflow payload artifact	4s
Call reusable workflow / Download PR workflow payload artifact	0s
	38m 2s

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