Remove duplicate tests in sentry_client_test.dart #2766

Job	Run time
cancel-previous-workflow	3s
android \| ubuntu-latest \| stable	1m 1s
android \| ubuntu-latest \| beta	1m 3s
linux \| ubuntu-latest \| stable	1m 38s
linux \| ubuntu-latest \| beta	1m 32s
windows \| windows-latest \| stable	2m 55s
ios \| macos-latest \| stable	1m 25s
macos \| macos-latest \| stable	1m 39s
analyze / cancel-previous-workflow	2s
analyze / analyze	1m 56s
analyze / package-analysis	2m 1s
	15m 15s

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