Tests: useful exception assert fail messages #1839

Job	Run time
flutter-integration-test (macos-13, 3.19.1)	16m 45s
flutter-integration-test (macos-13, 3.7.12)	11m 59s
flutter-integration-test (ubuntu-22.04, 3.19.1)	7m 21s
init-script	3m 2s
flutter-integration-test (ubuntu-22.04, 3.7.12)	7m 41s
generator	5m 46s
flutter-integration-test (windows-2022, 3.19.1)	6m 4s
lib (windows-2022, 3.3.0)	2m 10s
flutter-integration-test (windows-2022, 3.7.12)	6m 27s
lib (windows-2022, 3.2.3)	2m 8s
lib (windows-2022, 2.18.6)	2m 15s
lib (macos-13, 3.3.0)	2m 15s
lib (macos-13, 3.2.3)	2m 1s
lib (macos-13, 2.18.6)	1m 55s
lib (ubuntu-22.04, 3.3.0)	1m 27s
lib (ubuntu-22.04, 3.2.3)	1m 34s
lib (ubuntu-22.04, 2.18.6)	1m 34s
	1h 22m 24s

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