chore(platform): Remove CF Analytics engine

[betimshahini]

Remove CF Analytics engine references and code from the codebase. Replace with Posthog equivalents, as applicable.

[alfl]

Submitted request to delete Grafana account to their support.

[alfl]

Cloudflare datasets will expire 93 days after collection stops:

[alfl]

Scope of the bindings:

./platform/core/wrangler.current.toml:30:  { binding = "Analytics", dataset = "PlatformAnalyticsDev" },
./platform/core/wrangler.next.toml:30:  { binding = "Analytics", dataset = "PlatformAnalyticsDev" },
./platform/core/wrangler.dev.toml:30:  { binding = "Analytics", dataset = "PlatformAnalyticsDev" },
./platform/galaxy/wrangler.current.toml:16:  { binding = "Analytics", dataset = "PlatformAnalytics" },
./platform/galaxy/wrangler.next.toml:16:  { binding = "Analytics", dataset = "PlatformAnalytics" },
./platform/galaxy/wrangler.dev.toml:16:  { binding = "Analytics", dataset = "PlatformAnalytics" },
./platform/galaxy/wrangler.toml:13:  { binding = "Analytics", dataset = "PlatformAnalytics" },
./platform/object/wrangler.toml:13:  { binding = "Analytics", dataset = "PlatformAnalytics" },
./platform/object/wrangler.toml:29:  { binding = "Analytics", dataset = "PlatformAnalyticsDev" },
./platform/object/wrangler.toml:41:  { binding = "Analytics", dataset = "PlatformAnalyticsNext" },
./platform/object/wrangler.toml:53:  { binding = "Analytics", dataset = "PlatformAnalyticsCurrent" },