Breaking change page for `ColorScheme` change #407

Job	Run time
Validate Firebase configuration	31s
Check if code excerpts are up to date	1m 0s
Build site and check links	4m 7s
Analyze and test code examples (Beta channel, beta, true)	10m 39s
Analyze and test code examples (Stable channel, stable, false)	12m 25s
	28m 42s

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