Backstage project template config

[MiniMarker]

Create a template configuration used for Backstage to scaffold the project and setup in GitLab.

Config should execute the following actions:

1. Copy files and replace template variables defined across the template.
2. Initialise a new GitLab repository with the name of the project.
3. Registrer the Backstage components.

Known template variables defined:

• projectName
• projectDescription
• backstageOwnerGroup
• backstageOwnerSystem
• gitlabProjectSlug (this should be filled using output from step 2 above)
• teamsOpsChannelUrl