ci(e2e): run on ubuntu-latest again, with infra-e2e importing kind images per platform

Docker 29 (ubuntu-26.04 runners) uses the containerd image store, where a
pulled multi-platform image holds only the host platform; importing every
platform into kind failed for the OAP image ("content digest ... not
found"). Saved for one platform, the archive also lists the image's
referrers, such as attestations, at its top level, and the containerd 1.7
kindest/node:v1.28.15 these cases pin imports each one as an image, which
failed for the Rover image ("mismatched image rootfs and manifest layers").
infra-e2e now saves only the node platform and leaves the referrers out of
the archive (apache/skywalking-infra-e2e#150, #151), so the e2e cases follow
ubuntu-latest again instead of the ubuntu-24.04 pin #205 added.

Author: wu-sheng

.github/workflows/e2e.yaml

@@ -225,10 +225,7 @@ concurrency:
 jobs:
   e2e:
     name: ${{ matrix.case.name }}
-    # Not ubuntu-latest: on ubuntu-26.04, kind cannot load the multi-platform
-    # OAP image into its node (`ctr images import --all-platforms`: content
-    # digest not found), so the kind cases fail before any test runs.
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-latest
     timeout-minutes: 45
     strategy:
       # One case failing must not cancel the others: when several go red at
@@ -292,7 +289,7 @@ jobs:
         run: make -C test/e2e images
 
       - name: ${{ matrix.case.name }}
-        uses: apache/skywalking-infra-e2e@68bbdec303cf2d3df9f2353f970f91938b52f674
+        uses: apache/skywalking-infra-e2e@d468de17a56ae9c1a076d78f88c05b64fb8ee3c6
         with:
           e2e-file: $GITHUB_WORKSPACE/${{ matrix.case.config }}
           # Container logs land here. On a red run they answer the first