tests: Fold live migration tests into x86-64 script

Move the live migration test running from their own script into the
x86-64 script (on aarch64 they were already in the same script.) They
were historically separate as they were new. Now they are established it
makes sense for them to be combined.

The timeout in the GitHub workflow has been extended to accommodate the
extra work in the same step.

The Rust test scopes are unchanged - the running of the tests has been
moved.

Assisted-by: Claude:Opus-4.7
Signed-off-by: Rob Bradford <rbradford@meta.com>

.github/workflows/integration-x86-64.yaml

@@ -47,12 +47,8 @@ jobs:
         run: sudo modprobe openvswitch
       - name: Run integration tests
         if: ${{ github.event_name != 'pull_request' || (matrix.runner == 'garm-jammy' && matrix.libc == 'gnu') }}
-        timeout-minutes: 60
+        timeout-minutes: 80
         run: scripts/dev_cli.sh tests --integration --libc ${{ matrix.libc }}
-      - name: Run live-migration integration tests
-        if: ${{ github.event_name != 'pull_request' || (matrix.runner == 'garm-jammy' && matrix.libc == 'gnu') }}
-        timeout-minutes: 20
-        run: scripts/dev_cli.sh tests --integration-live-migration --libc ${{ matrix.libc }}
       - name: Skipping build for PR
         if: ${{ github.event_name == 'pull_request' && matrix.runner != 'garm-jammy' && matrix.libc != 'gnu' }}
         run: echo "Skipping build for PR"