feat: hide CR timetable in the presence of special alerts #5606

Job	Run time
Build Docker image	5m 58s
Build application and assets	5m 58s
file_changes	3s
Linting / Elixir	3m 31s
Formatting / Elixir	2m 56s
Formatting / JavaScript & TypeScript	28s
Linting / TypeScript	37s
Unit tests / JavaScript / Mocha	38s
Unit tests / JavaScript & TypeScript / Jest	2m 12s
Linting / JavaScript	22s
Linting / CSS	23s
Type checks / Elixir	3m 57s
Type checks / TypeScript	41s
Unit tests / Elixir / mix coveralls.html	1s
	27m 45s

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