Plugin E2E: Fix datasource picker root locator (#1483) #5172

Job	Run time
Run unit tests	52s
Test plugin scaffolding (myorg-nobackend-app, --plugin-name='no-backend' --org-name='myorg' --plu...	2m 16s
Test plugin scaffolding (myorg-backend-app, --plugin-name='backend' --org-name='myorg' --plugin-t...	3m 5s
Test plugin scaffolding (myorg-nobackend-panel, --plugin-name='no-backend' --org-name='myorg' --p...	2m 0s
Test plugin scaffolding (myorg-nobackend-datasource, --plugin-name='no-backend' --org-name='myorg...	2m 5s
Test plugin scaffolding (myorg-backend-datasource, --plugin-name='backend' --org-name='myorg' --p...	2m 48s
Test plugin scaffolding (myorg-nobackendscenes-app, --plugin-name='no-backend-scenes' --org-name=...	2m 8s
Release packages	1m 26s
	16m 40s

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