Use Datadog registry in injector dev defaults

[AliDatadog]

Summary

• Change K8s injector-dev defaults from gcr.io/datadoghq to registry.datadoghq.com for apm-inject, lib-init images, and cluster-agent migration helpers.
• Change the auto-inject VM Agent compose fixture to pull the pinned Agent image from registry.datadoghq.com.
• Update the component-image docstring example to match the new default registry.

Why

The container registry guidance recommends registry.datadoghq.com for simple Datadog image pulls while keeping GCR as an explicit Google registry option. These defaults are used by local/dev test flows, so this keeps system-tests aligned with the current registry guidance.

Validation

• crane manifest registry.datadoghq.com/apm-inject:latest
• crane manifest registry.datadoghq.com/agent:7.78.4
• python3 -m py_compile utils/_context/_scenarios/k8s_injector_dev.py utils/k8s/k8s_component_image.py
• bash -n utils/scripts/ssi_wizards/k8s_injector_dev_wizard.sh
• ruby -e 'require "yaml"; YAML.load_file(ARGV.fetch(0)); puts "yaml ok"' utils/build/virtual_machine/provisions/auto-inject/docker/docker-compose-agent-prod.yml
• git diff --check

./format.sh did not complete locally because this machine does not have python3.12, and the script stops while building the runner environment before formatting.

[github-actions]

CODEOWNERS have been resolved as:

utils/_context/_scenarios/k8s_injector_dev.py                           @DataDog/system-tests-core
utils/build/virtual_machine/provisions/auto-inject/docker/docker-compose-agent-prod.yml  @DataDog/system-tests-core
utils/k8s/k8s_component_image.py                                        @DataDog/system-tests-core
utils/scripts/ssi_wizards/k8s_injector_dev_wizard.sh                    @DataDog/system-tests-core

[datadog-prod-us1-3]

 

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ℹ️ Info

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🧪 All tests passed
❄️ No new flaky tests detected

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