Fixes warnings like these:

▲ [WARNING] This case clause will never be evaluated because it duplicates an earlier case clause [duplicate-case]

    src/webviews/plus/graph/graphWebview.utils.ts:173:7:
      173 │     case 'github' satisfies Unbrand<GkProviderId>:

that started happening during pnpm run test here: f7facea (#4468)

Probably that started happening because graphWebview.utils.ts appeared in the test assembly for the first time, through a new chain of imports.

However, it does not appear on the main build task. Therefore I decided to modify building properties of tests, so the compiler become tolerant to these expressions as well as the main build.

Also fixes prettier that was broken in ff3858f (#4473)