Revert "fix: remove deprecated MINIO_ACCESS_KEY, MINIO_SECRET_KEY envs (#12173)"

This reverts commit b0baaeaa3d.

cmd/test-utils_test.go

@@ -82,6 +82,8 @@ func TestMain(m *testing.M) {
 	// disable ENVs which interfere with tests.
 	for _, env := range []string{
 		crypto.EnvKMSAutoEncryption,
+		config.EnvAccessKey,
+		config.EnvSecretKey,
 		config.EnvRootUser,
 		config.EnvRootPassword,
 	} {