Use devfile gem in spike branch

Things to do

• make sure the devfile integrates with the gitlab monolith - check update here
• use gemfile on rails to generate k8s resources instead of DevWorkspace resource
• remove "informer on DevWorkspace resources" in agentk and instead watch on Deployment
• process user devfile to inject editor components
• extract workspace URL during resource generation instead of fetching the URL from information received from agentk
• make changes to workspace states
  • remove actual state calculation from agentk
  • add actual state calculation in rails
• add support in devfile gem to add labels/annotations

Related to DWO dependency removal but will be tackled in a followup issue

• remove devworkspace_resource_version and devworkspacerouting_resource_version fields from the database
• add resource_version and processed_devfile field to the database

Related to DWO dependency removal but not sure if it will be within the scope of this issue

• process user devfile to inject project cloning components
• add tls certificates on agentk setup

MRs

• Rails MR : Remove DWO dependency (!112906 - merged)
• GA4K MR : Remove DWO (gitlab-org/cluster-integration/gitlab-agent!854 - merged)
• Devfile Gem MR : https://gitlab.com/gitlab-org/remote-development/devfile-gem/-/merge_requests/8+