ci: Migrate docker in docker arm64 runner to microVM (#1002)

We are migrating our docker in docker arm64 offering in CI to use
microVMs on K8s instead of EC2 instances. 
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Co-authored-by: campaigner-prod[bot] <87874424+campaigner-prod[bot]@users.noreply.github.com>

Author: campaigner-prod[bot]

.gitlab/templates/pipeline.yaml.tpl

@@ -330,7 +330,7 @@ signed layer bundle:
 build java lambdas:
   stage: integration-tests
   image: registry.ddbuild.io/images/docker:27.3.1
-  tags: ["docker-in-docker:arm64"]
+  tags: ["docker-in-docker:microvm-arm64"]
   rules:
     - when: on_success
   needs: []
@@ -349,7 +349,7 @@ build java lambdas:
 build dotnet lambdas:
   stage: integration-tests
   image: registry.ddbuild.io/images/docker:27.3.1
-  tags: ["docker-in-docker:arm64"]
+  tags: ["docker-in-docker:microvm-arm64"]
   rules:
     - when: on_success
   needs: []
@@ -368,7 +368,7 @@ build dotnet lambdas:
 build python lambdas:
   stage: integration-tests
   image: registry.ddbuild.io/images/docker:27.3.1
-  tags: ["docker-in-docker:arm64"]
+  tags: ["docker-in-docker:microvm-arm64"]
   rules:
     - when: on_success
   needs: []
@@ -387,7 +387,7 @@ build python lambdas:
 build node lambdas:
   stage: integration-tests
   image: registry.ddbuild.io/images/docker:27.3.1
-  tags: ["docker-in-docker:arm64"]
+  tags: ["docker-in-docker:microvm-arm64"]
   rules:
     - when: on_success
   needs: []