Add support to GTM and GA4 for First-Party mode#818

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dja wants to merge 2 commits intosegmentio:masterfrom

dja:integrations-google/gtm-custom-domain-option

Commits on Mar 19, 2025

Add support to GTM and GA4 for customizing the domain to allow for a first-party domain
dja
committed
Add `server_container_url` to config for GA4, update tests
dja
committed