feat: add accessibility test with report #4831

Job	Run time
Build application and assets	2m 54s
Build Docker image	3m 32s
file_changes	7s
Linting / TypeScript	35s
Linting / JavaScript	36s
Unit tests / JavaScript / Mocha	34s
Linting / Elixir	2m 16s
Unit tests / JavaScript & TypeScript / Jest	2m 4s
Linting / CSS	37s
Formatting / Elixir	26s
Formatting / JavaScript & TypeScript	27s
Type checks / Elixir	2m 11s
Type checks / TypeScript	33s
Unit tests / Elixir / mix coveralls.html	59s
	17m 51s

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