Publish packages and create a release

This MR creates two new jobs in the vscode-fork CI:

• publish-packages - publishes all WebIDE and VS Code server packages to the package registry
• make-release - creates a new Fork release

These run only on Git tags.

This MR also changes the release process. Now you use a script to generate a new tag (./scripts/gl/gl_create_tag.sh <dev|prod>). After we push this tag, the pipeline will build, publish and release the packages.

Example (viktomas/gitlab-web-ide-vscode-fork)

• package registry (after generating this package, I changed the package name vscode -> gitlab-web-ide-vscode-fork to match the existing packages.
• release page

Space for improvement

I wasn't able to link the generated packages to the release automatically. I think it is possible and maybe not even difficult, but I run out of time for this task.

Relates to gitlab#373490 (closed)