test: migrate from bun to pnpm and vitest

vitest.config.ts

@@ -1,8 +1,11 @@
 import { defineWorkersConfig } from "@cloudflare/vitest-pool-workers/config";
+import tsconfigPaths from "vite-tsconfig-paths";
+import { configDefaults } from "vitest/config";
 
 export default defineWorkersConfig({
+  plugins: [tsconfigPaths()],
   test: {
-    globals: true,
+    globals: false,
     setupFiles: ["./testSetup.ts"],
     poolOptions: {
       workers: {
@@ -10,14 +13,18 @@ export default defineWorkersConfig({
       },
     },
     coverage: {
+      ...configDefaults.coverage,
       provider: "v8",
       reporter: ["text", "json", "html"],
       exclude: [
+        ...configDefaults.coverage.exclude,
         "node_modules/**",
         "dist/**",
         "**/*.spec.ts",
         "**/*.d.ts",
         "**/mocks/**",
+        "drizzle.config.ts",
+        "src/schema.ts",
       ],
     },
   },