Add arcgis.com to the CSP #5140

Job	Run time
Build application and assets	4m 12s
Build Docker image	5m 11s
file_changes	6s
Linting / JavaScript	31s
Linting / Elixir	3m 17s
Linting / TypeScript	40s
Unit tests / JavaScript / Mocha	40s
Linting / CSS	35s
Formatting / Elixir	2m 45s
Formatting / JavaScript & TypeScript	39s
Unit tests / JavaScript & TypeScript / Jest	2m 15s
Type checks / Elixir	3m 26s
Type checks / TypeScript	37s
Unit tests / Elixir / mix coveralls.html	1m 3s
	25m 57s

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