chore: extract shared buildShadowCss pipeline into design/ #777

Job	Run time
e2e	2m 44s
unit-test / test (ubuntu-latest, 26)	2m 49s
unit-test / lint	2m 3s
unit-test / test (windows-latest, 26)	4m 18s
unit-test / test (windows-latest, 24)	4m 45s
unit-test / test (ubuntu-latest, 22)	2m 58s
unit-test / test (ubuntu-latest, 24)	2m 51s
unit-test / test (windows-latest, 22)	4m 42s
	27m 10s

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