build: remove unnecessary Makefile output

Remove unnecessary @echo commands from Makefile.

These were originally comments but were changed to @echo in 6bc43ae.
They aren't terribly useful so let's remove them.

PR-URL: #23129
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Makefile

@@ -279,26 +279,20 @@ jstest: build-addons build-addons-napi ## Runs addon tests and JS tests
 # This does not run tests of third-party libraries inside deps.
 test: all ## Runs default tests, linters, and builds docs.
 	$(MAKE) -s test-doc
-	@echo "Build the addons before running the tests so the test results"
-	@echo "can be displayed together"
 	$(MAKE) -s build-addons
 	$(MAKE) -s build-addons-napi
 	$(MAKE) -s cctest
 	$(MAKE) -s jstest
 
 .PHONY: test-only
 test-only: all  ## For a quick test, does not run linter or build docs.
-	@echo "Build the addons before running the tests so the test results"
-	@echo "can be displayed together"
 	$(MAKE) build-addons
 	$(MAKE) build-addons-napi
 	$(MAKE) cctest
 	$(MAKE) jstest
 
 # Used by `make coverage-test`
 test-cov: all
-	@echo "Build the addons before running the tests so the test results"
-	@echo "can be displayed together"
 	$(MAKE) build-addons
 	$(MAKE) build-addons-napi
 	# $(MAKE) cctest