Modify CSP to allowlist snowplow domain when it's configured
Proposal
The current CSP implementation (enabled only in dev for now) doesn't take snowplow configuration into account. When snowplow is configured, the CSP should automatically take it into account without the need for manual configuration.
Contrary to most settings that affect the CSP, this isn't an environment variable or a static setting in the configuration file so it won't be as easy to support.