Adding in CookieFirst integrations

[travjenkins]

Changes

https://github.com/estuary/marketing-site/issues/250

• Load gTag manually again
• Add init scripts to set consent (https://support.cookiefirst.com/hc/en-us/articles/360013653618-Google-Consent-Mode-v2-without-GTM-Manual-integration)
• Add CookieFirst script tag
• Clean up old packages and code

Tests / Screenshots

• N/A

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 0673577):

https://estuary-marketing--pr271-travjenkins-consent-z7xjextb.web.app

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