Fix UI screens subscribing to events on every show #124

Job	Run time
Run tests + Build Sample APp (macos-latest, 2021.3.27, NET_4_x, il2cpp, standalone)	14m 37s
Run tests + Build Sample APp (macos-latest, 2021.3.27, NET_4_x, il2cpp, standalone)	14m 37s
Run tests + Build Sample APp (macos-latest, 2021.3.27, NET_4_x, il2cpp, mobile)	15m 18s
Run tests + Build Sample APp (macos-latest, 2021.3.27, NET_4_x, il2cpp, mobile)	15m 18s
Run tests + Build Sample APp (macos-latest, 2021.3.27, STANDARD_2_x, il2cpp, standalone)	18m 12s
Run tests + Build Sample APp (macos-latest, 2021.3.27, STANDARD_2_x, il2cpp, standalone)	18m 12s
Run tests + Build Sample APp (macos-latest, 2021.3.27, STANDARD_2_x, il2cpp, mobile)	14m 29s
Run tests + Build Sample APp (macos-latest, 2021.3.27, STANDARD_2_x, il2cpp, mobile)	14m 29s
Run tests + Build Sample APp (macos-latest, 2022.3.4, NET_4_x, il2cpp, standalone)	19m 43s
Run tests + Build Sample APp (macos-latest, 2022.3.4, NET_4_x, il2cpp, standalone)	19m 43s
Run tests + Build Sample APp (macos-latest, 2022.3.4, NET_4_x, il2cpp, mobile)	8m 3s
Run tests + Build Sample APp (macos-latest, 2022.3.4, NET_4_x, il2cpp, mobile)	16m 53s
Run tests + Build Sample APp (macos-latest, 2022.3.4, STANDARD_2_x, il2cpp, standalone)	18m 33s
Run tests + Build Sample APp (macos-latest, 2022.3.4, STANDARD_2_x, il2cpp, standalone)	18m 33s
Run tests + Build Sample APp (macos-latest, 2022.3.4, STANDARD_2_x, il2cpp, mobile)	14m 38s
Run tests + Build Sample APp (macos-latest, 2022.3.4, STANDARD_2_x, il2cpp, mobile)	14m 38s
	4h 15m 56s

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