refactor: replace Jest with bun

packages/utils/tests/auth.test.ts

@@ -1,4 +1,4 @@
-import { test, expect } from '@jest/globals'
+import { test, expect } from 'bun:test'
 import { isValidEmail, isValidUsername } from '../auth'
 
 test('check valid username', () => {

packages/utils/tests/commands.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from '@jest/globals'
+import { describe, it, expect } from 'bun:test'
 import { buildFileCheckCmd, File } from '../commands'
 
 describe('buildFileCheckCmd function', () => {

packages/utils/tests/dag.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from '@jest/globals'
+import { describe, it, expect } from 'bun:test'
 import DAG from '../dag'
 
 describe('dag layers', () => {