Don't require projects to contain Gemfile when using danger-review job
What does this MR do?
This MR triggers bundle init and adds gitlab-dangerfiles as a dependencies for the job danger-review if the project does not contain Gemfile.
Pin version of danger when GITLAB_DANGERFILES_VERSION is set.
Check-list
Project with Gemfile and Gemfile.lock
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Project without Gemfile - latest version 3.1.0
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Project without Gemfile - pinned version 3.0.0
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https://gitlab.com/gitlab-org/quality/pipeline-common/-/jobs/2573854313#L106 
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https://gitlab.com/gitlab-org/gitlab-ui/-/jobs/2573971479#L109 
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https://gitlab.com/gitlab-org/gitlab-ui/-/jobs/2573994940#L109 
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Verify the change in all affected pipelines.
Edited by Peter Leitzen