Drop dead maxWorkers/minWorkers under forks pool

Greptile summary flagged these as misleading: with pool: 'forks' the
active concurrency knobs are poolOptions.forks.maxForks/minForks, so the
top-level maxWorkers/minWorkers do nothing here.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/vitest.config.ts

@@ -5,8 +5,6 @@ export default defineConfig({
     environment: "node",
     isolate: true,
     maxConcurrency: 1,
-    maxWorkers: 1,
-    minWorkers: 1,
     pool: "forks",
     poolOptions: {
       forks: {