Enable Soroban diagnostic events in Horizon too (#511) #478

Job	Run time
amd64 / build-stellar-core	28s
amd64 / build-stellar-soroban-rpc	53s
amd64 / build-stellar-friendbot	54s
amd64 / build-stellar-horizon	2m 52s
arm64 / build-stellar-core	21s
arm64 / build-stellar-friendbot	2m 54s
arm64 / build-stellar-horizon	10m 38s
arm64 / build-stellar-soroban-rpc	43s
amd64 / build	3m 3s
amd64 / test (pubnet)	1m 50s
amd64 / test (local)	1m 42s
amd64 / push-pr	0s
amd64 / push-release	1m 3s
arm64 / build	6m 46s
arm64 / test (pubnet)	1m 23s
arm64 / test (local)	2m 28s
arm64 / push-pr	0s
arm64 / push-release	43s
manifest / push	6s
complete	1s
	38m 48s

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