freebuff web: Add posthog analytics #5971

Job	Run time
build-and-check	3m 16s
test-integration-packages/internal	1m 9s
test-integration-packages/billing	1m 10s
test-integration-packages/agent-runtime	52s
test-integration-web	50s
test-integration-common	46s
test-integration-cli	42s
test-common	43s
test-integration-sdk	1m 15s
test-packages/internal	51s
test-.agents	51s
test-web	54s
test-packages/agent-runtime	53s
test-cli	1m 0s
test-sdk	52s
test-packages/billing	41s
	16m 45s

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