Make dropdown style on project page consistent
This is the same as https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13193.
What does this MR do?
Change the dropdowns of the project page to new style.
The dropdowns belonging to the repository are covered by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13184.
Screenshots
Before | After |
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What are the relevant issue numbers?
gitlab-org/gitlab-ce#28921, gitlab-org/gitlab-ce#35424, gitlab-org/gitlab-ce#35778