Move EE prepend/include to the end of services

What does this MR do?

This moves all instances of prepend EE::Something and include EE::Something in service classes to the last line of the corresponding service class. This pushes EE specific code further down the files, reducing the likelihood of developers running into merge conflicts.

Approach

This was done using the following Ruby script: https://gitlab.com/gitlab-org/release/framework/snippets/1773219

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/8241

Does this MR meet the acceptance criteria?

• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• EE specific content should be in the top level /ee folder