refactor: move SuggestedChartRevisionStatus enum to clientUtils

[marcelgerber]

This is part 1 of ♾️ of the #1082 work.

I noticed that db had a dependency on adminSiteClient, which is a red flag really. Thankfully, the dependency only existed because of an enum import, and could be resolved by using this type to owidTypes in the bottom clientUtils module.

I also realized that TS project references are transitive (i.e. if A -> B and B -> C, then A can also import modules from C without explicitly listing C), so the project-dependencies.md graph doesn't even reflect all the various interdependencies that we have.