Examples: Add log data source #820

Job	Run time
setup-matrix	8s
run-integration-tests (./examples/datasource-streaming-backend-websocket/streaming-backend-websoc...	2m 39s
run-integration-tests (./examples/app-with-dashboards)	3m 23s
run-integration-tests (./examples/datasource-http-backend)	5m 4s
run-integration-tests (./examples/panel-flot)	1m 24s
run-integration-tests (./examples/datasource-basic)	7m 9s
run-integration-tests (./examples/panel-basic)	4m 40s
run-integration-tests (./examples/datasource-http)	1m 26s
run-integration-tests (./examples/panel-frame-select)	1m 22s
run-integration-tests (./examples/datasource-logs)	1m 39s
run-integration-tests (./examples/panel-visx)	1m 27s
run-integration-tests (./examples/app-with-on-behalf-of-auth)	3m 55s
run-integration-tests (./examples/app-with-scenes)	3m 30s
run-integration-tests (./examples/app-with-extensions)	3m 36s
run-integration-tests (./examples/datasource-streaming-websocket/streaming-websocket-plugin)	1m 29s
run-integration-tests (./examples/app-with-extension-point)	3m 11s
run-integration-tests (./examples/app-with-backend)	4m 1s
run-integration-tests (./examples/app-basic)	3m 38s
run-integration-tests (./examples/panel-scatterplot)	1m 46s
run-integration-tests (./examples/panel-plotly)	4m 6s
run-integration-tests (./examples/panel-datalinks)	4m 5s
notify	0s
	1h 3m 38s

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