chore: Rename otel classes #18870

Job	Run time
generation-config-check	1m 48s
gapic-libraries-bom	16m 53s
changes	4s
lint	3m 12s
bulk-filter	1m 11s
windows	2m 13s
enforcer	19m 15s
split-units (sdk-platform-java, 11)	4m 46s
split-units (sdk-platform-java, 25)	4m 33s
split-units (sdk-platform-java, 8)	2m 39s
split-units (sdk-platform-java, 17)	5m 25s
split-units (sdk-platform-java, 21)	4m 55s
units (8)	42m 56s
units (11)	40m 4s
units (21)	31m 48s
units (17)	34m 29s
units (25)	33m 27s
	4h 9m 38s

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