test(machine_type_test): fix flag parsing and mounted directory in gke/machine_type_test (#4877)

* test(gke): fix flag parsing and mounted directory resolution in machine type tests

* Update perfmetrics/scripts/continuous_test/gke/machine_type_test/run_test.sh

Author: PranjalC100

perfmetrics/scripts/continuous_test/gke/machine_type_test/run_test.sh

@@ -43,6 +43,7 @@ echo "Step 4: Running tests ..."
 # These tests are chosen to verify that machine-type is correctly passed by
 # CSI Driver to GCSFuse and GCSFuse is correctly accepting it and triggering optimization flags
 # like implicit-dirs and rename-dir-limit for high-performance machine-type as expected.
-go test -v ./tools/integration_tests/flag_optimizations/... --integrationTest --config-file="$(pwd)/tools/integration_tests/test_config.yaml" --mountedDirectory=/data_mnt --testbucket="$BUCKET_NAME" -run "TestImplicitDirsEnabled|TestRenameDirLimitSet"
+export MOUNTED_DIR="/data_mnt"
+go test -v ./tools/integration_tests/flag_optimizations/... -run "TestImplicitDirsEnabled|TestRenameDirLimitSet" -args --integrationTest --config-file="$(pwd)/tools/integration_tests/test_config.yaml" --mountedDirectory="${MOUNTED_DIR}" --testbucket="$BUCKET_NAME"
 
 echo "Step 5: Test finished successfully."