Use built-in license seed file instead of custom function

What does this MR do?

This changes the charts version used to deploy the Review App to use gitlab-org/charts/gitlab!1008 (merged), which allows to use the built-in license seeding method, instead of a custom function in our Review App deployment scripts.

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• License is properly added (migrations log):

2019-10-31T15:08:48.947245063Z License Added: I 
2019-10-31T15:08:48.947257350Z FilePath: /srv/gitlab/config/Gitlab.gitlab-license I 

Closes #32568 (closed).