ci(make): drop duplicate container-health-check and test-docker recipes

Both targets were defined twice — once in deploy.mk and once in the
file that ended up winning (Makefile for container-health-check,
dev.mk for test-docker). Make printed the override warnings on every
invocation:

    deploy.mk:27: warning: overriding commands for target `test-docker'
    dev.mk:94: warning: ignoring old commands for target `test-docker'
    Makefile:64: warning: overriding commands for target `container-health-check'
    deploy.mk:24: warning: ignoring old commands for target `container-health-check'

The deploy.mk versions were the older / overridden copies. Drop them
and leave a comment explaining where each canonical recipe lives.

Author: fgogolli

makefiles/deploy.mk

@@ -20,14 +20,6 @@ container-show-version: dev-install  ## Show container version info
 container-run: dev-install  ## Run container build
 	@./dev-tools/container/container_dispatcher.py run
 
-container-health-check:  ## Poll container health check endpoint
-	@./dev-tools/container/container_health_check.py
-
-test-docker:  ## Run Docker test suite (build, startup, security, pytest tests/docker/)
-	@./dev-tools/testing/test-docker.sh
-
-# Dummy targets removed (consolidated in quality.mk)
-
 # @SECTION Documentation
 # Documentation targets
 docs: dev-install  ## Build/manage docs (usage: make docs [serve] [deploy] [version=X.X.X] [list] [delete=X.X.X] [clean])