ci: Make errors fatal

We have `continue-on-error: true` marked on several integration
workflows. It appears that GitHub's behavior has changed to now mark
these tests as green even when they fail.

This change removes this setting from integration tests so errors are
reported properly.

.github/workflows/integration.yml

@@ -121,7 +121,6 @@ jobs:
         test:
           - cni-calico-deep
           - deep
-    continue-on-error: true
     runs-on: ubuntu-20.04
     timeout-minutes: 15
     steps:
@@ -262,7 +261,6 @@ jobs:
           - uninstall
           - upgrade-edge
           - upgrade-stable
-    continue-on-error: true
     runs-on: ubuntu-20.04
     timeout-minutes: 15
     steps:
@@ -305,7 +303,6 @@ jobs:
   test-viz:
     needs: [tag, changed-viz, build-cli, build-core, build-ext]
     if: needs.changed-viz.outputs.modified == 'true'
-    continue-on-error: true
     runs-on: ubuntu-20.04
     timeout-minutes: 15
     steps: