feat: deprecate `contrib.opentelemetry` #6267

Job	Run time
validate	18s
mypy	1m 6s
pyright	39s
slotscheck	16s
test_typing_extensions (latest)	21s
test_typing_extensions (4.13.1)	18s
test_typing_extensions (4.12.1)	21s
Test server integration (uvicorn>=0.27.0)	43s
Test server integration (uvicorn<0.27.0)	56s
Test Minimal Application with Base Dependencies	22s
Test Minimal Pydantic 1 application	26s
test-platform-compat	0s
test (3.9) / test	1m 57s
test (3.10) / test	1m 49s
test (3.11) / test	1m 36s
test (3.12) / test	2m 24s
test (3.13) / test	1m 35s
build-docs	1m 54s
test_success	2s
upload-test-coverage	26s
codeql	2m 20s
	19m 49s

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