chore: skip flaky smoke test on all staging environments #5515

Job	Run time
Build Docker image	7m 16s
file_changes	5s
Build application and assets	6m 47s
Linting / TypeScript	37s
Linting / CSS	34s
Linting / JavaScript	20s
Linting / Elixir	0s
Unit tests / JavaScript / Mocha	35s
Unit tests / JavaScript & TypeScript / Jest	2m 8s
Formatting / Elixir	3m 10s
Formatting / JavaScript & TypeScript	39s
Type checks / TypeScript	34s
Type checks / Elixir	3m 44s
Unit tests / Elixir / mix coveralls.html	1m 8s
	27m 37s

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