[GHA] Switch off GPU tests in precommit, post-commit and nightly (ope…

…nvinotoolkit#26559)

### Details:
 - Switch off GPU tests in GHA

### Tickets:
 - 152280

.github/workflows/ubuntu_20.yml

@@ -132,7 +132,8 @@ jobs:
       runner: "[ 'self-hosted', 'igpu' ]"
       container: '{"image": "ubuntu:20.04", "volumes": ["/dev/dri:/dev/dri"], "options": "--group-add 109 --group-add 44
         --device /dev/dri:/dev/dri"}'
-    if: fromJSON(needs.smart_ci.outputs.affected_components).GPU
+    # if: fromJSON(needs.smart_ci.outputs.affected_components).GPU
+    if: ${{ 'false' }} # Ticket: 152280
 
   dGPU:
     name: dGPU Tests
@@ -149,11 +150,12 @@ jobs:
       runner: "[ 'self-hosted', 'dgpu' ]"
       container: '{"image": "ubuntu:20.04", "volumes": ["/dev/dri:/dev/dri"], "options": "--group-add 109 --group-add 44
         --device /dev/dri/card0:/dev/dri/card0  --device /dev/dri/renderD128:/dev/dri/renderD128"}'
-    if: ${{ github.event_name == 'schedule' }}
+    # if: ${{ github.event_name == 'schedule' }}
+    if: ${{ 'false' }} # Ticket: 152280
 
   Overall_Status:
     name: ci/gha_overall_status_ubuntu_20
-    needs: [Smart_CI, Build, iGPU, Debian_Packages, Samples]
+    needs: [Smart_CI, Build, Debian_Packages, Samples]
     if: ${{ always() }}
     runs-on: ubuntu-latest
     steps: