Revert "[GHA] Temporarily remove GPU tests from mandatory" (#25676)

Reverts #25645
Hopefully runners will stay alive

Author: akladiev

.github/workflows/linux.yml

@@ -705,7 +705,7 @@ jobs:
   Overall_Status:
     name: ci/gha_overall_status
     needs: [Smart_CI, Build, Debian_Packages, Samples, Conformance, ONNX_Runtime, CXX_Unit_Tests, Python_Unit_Tests, TensorFlow_Layer_Tests,
-            CPU_Functional_Tests, TensorFlow_Models_Tests_Precommit, PyTorch_Models_Tests, NVIDIA_Plugin, Openvino_tokenizers]
+            CPU_Functional_Tests, TensorFlow_Models_Tests_Precommit, PyTorch_Models_Tests, NVIDIA_Plugin, Openvino_tokenizers, iGPU]
     if: ${{ always() }}
     runs-on: ubuntu-latest
     steps: