refactor(accordion): mark colorVariant as deprecated in si-collapsibl… #770

Job	Run time
build-and-test / build	4m 40s
build-and-test / test	4m 46s
build-and-test / e2e (1, 2)	6m 52s
build-and-test / aot	3m 46s
build-and-test / e2e (2, 2)	6m 51s
build-and-test / coverage	15s
build-and-test / documentation	3m 47s
build-and-test / e2e-merge-reports	14s
build-and-test / preview	0s
publish-documentation	42s
	31m 53s

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