fix(realtime): lost `postgres_changes` on resubscribe #668

Job	Run time
Examples	5m 2s
Examples	5m 2s
linux (5.10)	3m 42s
linux (5.10)	3m 42s
xcodebuild (test, IOS, 15.4)	7m 43s
xcodebuild (test, IOS, 15.4)	7m 43s
xcodebuild (test, IOS, 16.0)	2h 34m 46s
xcodebuild (test, IOS, 16.0)	8m 34s
xcodebuild (test, MAC_CATALYST, 15.4)	6m 12s
xcodebuild (test, MAC_CATALYST, 15.4)	6m 12s
xcodebuild (test, MAC_CATALYST, 16.0)	6m 1s
xcodebuild (test, MAC_CATALYST, 16.0)	6m 1s
xcodebuild (test, MACOS, 15.4)	6m 38s
xcodebuild (test, MACOS, 15.4)	6m 38s
xcodebuild (test, MACOS, 16.0)	5m 59s
xcodebuild (test, MACOS, 16.0)	5m 59s
xcodebuild (test, TVOS, 15.4)	5m 15s
xcodebuild (test, TVOS, 15.4)	5m 15s
xcodebuild (test, TVOS, 16.0)	6m 32s
xcodebuild (test, TVOS, 16.0)	6m 32s
xcodebuild (test, WATCHOS, 15.4)	7m 41s
xcodebuild (test, WATCHOS, 15.4)	7m 41s
xcodebuild (test, WATCHOS, 16.0)	6m 23s
xcodebuild (test, WATCHOS, 16.0)	6m 23s
xcodebuild (IOS, 15.4)	4m 30s
xcodebuild (IOS, 15.4)	4m 30s
xcodebuild (IOS, 16.0)	4m 49s
xcodebuild (IOS, 16.0)	4m 49s
xcodebuild (MAC_CATALYST, 15.4)	5m 12s
xcodebuild (MAC_CATALYST, 15.4)	5m 12s
xcodebuild (MAC_CATALYST, 16.0)	5m 14s
xcodebuild (MAC_CATALYST, 16.0)	5m 14s
xcodebuild (MACOS, 15.4)	6m 16s
xcodebuild (MACOS, 15.4)	6m 16s
xcodebuild (MACOS, 16.0)	4m 44s
xcodebuild (MACOS, 16.0)	4m 44s
xcodebuild (TVOS, 15.4)	4m 21s
xcodebuild (TVOS, 15.4)	4m 21s
xcodebuild (TVOS, 16.0)	6m 45s
xcodebuild (TVOS, 16.0)	6m 45s
xcodebuild (WATCHOS, 15.4)	5m 32s
xcodebuild (WATCHOS, 15.4)	5m 32s
xcodebuild (WATCHOS, 16.0)	6m 15s
xcodebuild (WATCHOS, 16.0)	6m 15s
	6h 44m 52s

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