Remove robustness presubmits for amd64 arch

.github/workflows/robustness-nightly.yaml

@@ -11,17 +11,6 @@ on:
   workflow_dispatch:
 
 jobs:
-  main:
-    # GHA has a maximum amount of 6h execution time, we try to get done within 3h
-    uses: ./.github/workflows/robustness-template.yaml
-    with:
-      etcdBranch: main
-      count: 150
-      testTimeout: 200m
-      artifactName: main
-      runs-on: "['ubuntu-latest-8-cores']"
-      scenario: TestRobustnessExploratory
-      lazyfsEnabled: true
   main-arm64:
     uses: ./.github/workflows/robustness-template.yaml
     with:
@@ -32,16 +21,6 @@ jobs:
       runs-on: "['actuated-arm64-12cpu-8gb']"
       scenario: TestRobustnessExploratory
       lazyfsEnabled: false
-  release-35:
-    uses: ./.github/workflows/robustness-template.yaml
-    with:
-      etcdBranch: release-3.5
-      count: 150
-      testTimeout: 200m
-      artifactName: release-35
-      runs-on: "['ubuntu-latest-8-cores']"
-      scenario: TestRobustnessExploratory
-      lazyfsEnabled: true
   release-35-arm64:
     uses: ./.github/workflows/robustness-template.yaml
     with:
@@ -52,13 +31,3 @@ jobs:
       runs-on: "['actuated-arm64-12cpu-8gb']"
       scenario: TestRobustnessExploratory
       lazyfsEnabled: false
-  release-34:
-    uses: ./.github/workflows/robustness-template.yaml
-    with:
-      etcdBranch: release-3.4
-      count: 150
-      testTimeout: 200m
-      artifactName: release-34
-      runs-on: "['ubuntu-latest-8-cores']"
-      scenario: TestRobustnessExploratory
-      lazyfsEnabled: true