feat: Enhance PostHog integration with referral tracking and error ha… #9

Job	Run time
build (linux/arm64, backend)	6m 15s
build (linux/amd64, web)	3m 50s
build (linux/arm64, web)	2m 50s
build (linux/amd64, backend)	1m 2s
tag_release	-1s
create_manifest (surfsense-web, web)	28s
create_manifest (surfsense-backend, backend)	22s
	14m 46s

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