Add ObservabilityPipelineWebsocketSource to schema #18663

Job	Run time
test / test (2.7, ubuntu-latest)	2m 30s
test / test (jruby-9.4.12.0, ubuntu-latest)	4m 1s
test / test (3.2, ubuntu-latest)	4m 15s
examples / examples	3m 21s
pre-commit / pre-commit	1m 20s
report	7s
	15m 34s

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