Add docker pull to Container Registry CVS E2E spec

What does this MR do and why?

Fix for https://gitlab.com/gitlab-org/gitlab/-/issues/501314

Ensure we run a docker pull on the base image before tagging for the Container Registry CVS spec

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

If it exists, remove alpine:3.10.0 and attempt to tag image should fail:

 % docker image rm alpine:3.10.0
Untagged: alpine:3.10.0
Untagged: alpine@sha256:ca1c944a4f8486a153024d9965aafbe24f5723c1d5c02f4964c045a16d19dc54

docker tag alpine:3.10.0 registry.staging.gitlab.com/gitlab-qa-sandbox-group-3/qa-test-2024-10-29-21-20-13-b40a4e8f84d61f17/container-registry-cvs-project-c09fd3745671b93b:latest
Error response from daemon: No such image: alpine:3.10.0

Run the test:

GITLAB_QA_USER_AGENT =<USER_AGENT> GITLAB_ADMIN_USERNAME=<ADMIN_USERNAME> GITLAB_ADMIN_PASSWORD="<ADMIN_PASSWORD>" GITLAB_USERNAME=<USERNAME> GITLAB_QA_ACCESS_TOKEN="<ACCESS_TOKEN>" GITLAB_PASSWORD="<GITLAB_PASSWORD>"  QA_DEBUG=true WEBDRIVER_HEADLESS=true bundle exec bin/qa Test::Instance::All https://staging.gitlab.com qa/specs/features/ee/browser_ui/13_secure/cvs_container_registry_spec.rb