fix(realtime): lost `postgres_changes` on resubscribe #660

Job	Run time
linux (5.10)	4m 40s
Examples	4m 37s
xcodebuild (test, IOS, 15.4)	7m 25s
xcodebuild (test, IOS, 16.0)	9m 32s
xcodebuild (test, MAC_CATALYST, 15.4)	5m 10s
xcodebuild (test, MAC_CATALYST, 16.0)	7m 0s
xcodebuild (test, MACOS, 15.4)	4m 33s
xcodebuild (test, MACOS, 16.0)	4m 28s
xcodebuild (test, TVOS, 15.4)	5m 47s
xcodebuild (test, TVOS, 16.0)	7m 10s
xcodebuild (test, WATCHOS, 15.4)	5m 37s
xcodebuild (test, WATCHOS, 16.0)	4m 52s
xcodebuild (IOS, 15.4)	4m 6s
xcodebuild (IOS, 16.0)	4m 37s
xcodebuild (MAC_CATALYST, 15.4)	4m 4s
xcodebuild (MAC_CATALYST, 16.0)	6m 12s
xcodebuild (MACOS, 15.4)	4m 14s
xcodebuild (MACOS, 16.0)	6m 44s
xcodebuild (TVOS, 15.4)	4m 50s
xcodebuild (TVOS, 16.0)	4m 39s
xcodebuild (WATCHOS, 15.4)	5m 2s
xcodebuild (WATCHOS, 16.0)	8m 45s
	2h 4m 4s

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