Automate GitLab release upon each build triggered by an upstream TCDB_FULL 3.3.5 SQL release

• Only run if the map data generated okay (BUILD_MAPDATA should be true and maybe check TRIGGER_PAYLOAD like {"ref":"master","variables":{"BUILD_MAPDATA":"true"},"id":"30462508"})
• Ensure there are proper dependencies between build, container-test and deploy stage jobs first
• Ensure that we're not caching the Docker images under too broad a key (base it off of the commit ref SHA if need be)
• Add a final release stage in CI as we do with tcpasswd
• Link to map data and to published Docker Hub docker.io images (a link to every tagged image)
• Link to upstream TCDB_FULL 3.3.5 SQL release URLs
• Link to upstream TrinityCore GitHub commit URL
• Add some helpful HTML description
• Link to all TrinityCore documentation and help resources and URLs
• Link to tcpasswd project
• Link to tcadmin project
• Link to YouTube guide videos
• Remove use of VERSION, replacing with simple Git tags
• Add a CHANGELOG.md