Fix: Creating rails template without addons doesn't import spec helper files

[bterone]

Issue

When creating a new project and selecting no to all addons, the project doesn't import some helpers e.g. rails_helper.rb, spec_helper.rb and disable_animation.rb which causes issues when running tests

Expected

Correctly import the spec helpers regardless of what addons are picked

Steps to reproduce

1. Create a project using the template with no addons
2. Host project on Github and run Github workflows
3. Observe failure in the docker-asset-precompile step