Add ObservabilityPipelineWebsocketSource to schema #18668

Job	Run time
test / test (3.2, ubuntu-latest)	1m 42s
test / test (2.7, ubuntu-latest)	2m 10s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 55s
pre-commit / pre-commit	1m 27s
examples / examples	3m 14s
report	6s
	12m 34s

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