Remove remnants of internal OTLP types

Signed-off-by: Yuri Shkuro <github@ysh.us>

Makefile.Protobuf.mk

@@ -84,7 +84,6 @@ proto: proto-model \
 	proto-hotrod \
 	proto-zipkin \
 	proto-openmetrics \
-	proto-otel \
 	proto-api-v3
 
 .PHONY: proto-model
@@ -121,31 +120,6 @@ proto-hotrod:
 proto-zipkin:
 	$(call proto_compile, proto-gen/zipkin, idl/proto/zipkin.proto, -Iidl/proto)
 
-# Target 'proto-prepare-otel' modifies OTEL proto to use proto-import path jaeger.proto.*
-# The modification is needed because OTEL collector already uses opentelemetry.proto.*
-# and two compiled protobuf types cannot have the same import path. The root cause is that the compiled OTLP
-# in the collector is in private package, hence it cannot be used in Jaeger.
-.PHONY: proto-prepare-otel
-proto-prepare-otel:
-	$(call print_caption, Enriching OpenTelemetry Protos into $(PATCHED_OTEL_PROTO_DIR))
-
-	rm -rf $(PATCHED_OTEL_PROTO_DIR)
-	mkdir -p $(PATCHED_OTEL_PROTO_DIR)
-
-	@# TODO replace otel_proto_patch.sed below with otel/collector/proto_patch.sed to include gogo annotations.
-	@$(foreach file,$(OTEL_PROTO_FILES), \
-	   $(call exec-command,\
-	     echo $(file); \
-		 mkdir -p $(shell dirname $(PATCHED_OTEL_PROTO_DIR)/$(file)); \
-		 $(SED) -f otel_proto_patch.sed $(OTEL_PROTO_SRC_DIR)/$(file) > $(PATCHED_OTEL_PROTO_DIR)/$(file)))
-
-# Target 'proto-otel' generates classes for OpenTelemetry OTLP format. We cannot reuse similar classes
-# already generated by OTel Collector because those are private / internal.
-.PHONY: proto-otel
-proto-otel: proto-prepare-otel
-	$(foreach file,$(OTEL_PROTO_FILES), \
-	  $(call proto_compile, proto-gen/otel, $(file), -I$(PATCHED_OTEL_PROTO_DIR), paths=source_relative))
-
 # The API v3 service uses official OTEL type opentelemetry.proto.trace.v1.TracesData,
 # which at runtime is mapped to a custom type in cmd/query/app/internal/api_v3/traces.go
 # Unfortunately, gogoproto.customtype annotation cannot be applied to a method's return type,