Update common CSS for MR approvals
What does this MR do?
This contains the common css updates for https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9003.
- Adds some common classes
- Updates common css layout (there's more to be done here)
- Adds classes for using to wrap inputs
- Adds select2 bootstrap validation support
- Fixes select2 in modal z-index
- Adds thead-white class
What are the relevant issue numbers?
- Part of gitlab-ee#1979
- FE gitlab-ee#8350
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Tested in all supported browsers -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
Security reports checked/validated by reviewer