[chore] Fix update-otel (open-telemetry#37706)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This PR fixed `make update-otel` to update `builder-config.yaml`
correctly. This is the workflow we update `builder-config.yaml` files:
1. `MULTIMOD` command to update `go.mod`
2. `updatehelper` function to update `builder-config.yaml` according to
the updated `go.mod`

However, `make otelcontribcol/make oteltestbedcol` will overwrite the
updated `go.mod` unexpectedly before step 2.
This PR removes the unexpected `make otelcontribcol/make oteltestbedcol`
commands.

cc @mx-psi 
<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
n/a

<!--Describe what testing was performed and which tests were added.-->
#### Testing
n/a

<!--Describe the documentation added.-->
#### Documentation
n/a

<!--Please delete paragraphs that you did not use before submitting.-->

Makefile

@@ -423,18 +423,17 @@ endef
 
 .PHONY: update-otel
 update-otel:$(MULTIMOD)
+	# Make sure cmd/otelcontribcol/go.mod and cmd/oteltestbedcol/go.mod are present
+	$(MAKE) genotelcontribcol
+	$(MAKE) genoteltestbedcol
 	$(MULTIMOD) sync -s=true -o ../opentelemetry-collector -m stable --commit-hash $(OTEL_STABLE_VERSION)
 	git add . && git commit -s -m "[chore] multimod update stable modules" ; \
 	$(MULTIMOD) sync -s=true -o ../opentelemetry-collector -m beta --commit-hash $(OTEL_VERSION)
 	git add . && git commit -s -m "[chore] multimod update beta modules" ; \
 	$(MAKE) gotidy
-	# Ensure the otelcontribcol is generated, update deps, then
-	$(MAKE) genotelcontribcol
 	$(call updatehelper,$(CORE_VERSIONS),./cmd/otelcontribcol/go.mod,./cmd/otelcontribcol/builder-config.yaml)
-	$(MAKE) genotelcontribcol
-	# Ensure the otelcontribcol is generated.
-	$(MAKE) genoteltestbedcol
 	$(call updatehelper,$(CORE_VERSIONS),./cmd/oteltestbedcol/go.mod,./cmd/oteltestbedcol/builder-config.yaml)
+	$(MAKE) genotelcontribcol
 	$(MAKE) genoteltestbedcol
 	$(MAKE) generate
 	$(MAKE) crosslink