Flaky buildpacks test

There are a couple of tests failing related with buildpacks. They started to fail without adding any changes to the buildpacks logic in Skaffold.

1. [Test link](https://github.com/GoogleContainerTools/skaffold/actions/runs/5032829209/jobs/9080028234?pr=8801)
```
--- FAIL: TestRun (125.22s)
/v2/integration/TestRun/buildpacks_NodeJS
util.go:90: Assinged test TestRun/buildpacks_NodeJS to partition: 1
exit status 1
time="2023-05-23T15:29:45Z" level=info msg="Namespace: skaffold7d4lb" subtask=-1 task=DevLoop
make: *** [Makefile:148: integration-tests] Error 1
helper.go:260: Running [skaffold run --namespace skaffold7d4lb --default-repo us-central1-docker.pkg.dev/k8s-skaffold/testing --cache-artifacts=false] in examples/buildpacks-node
helper.go:260: skaffold run: exit status 1, Generating tags...
- skaffold-buildpacks-node -> us-central1-docker.pkg.dev/k8s-skaffold/testing/skaffold-buildpacks-node:test-v0.0.0-14-gf3671be56
Starting build...
Found [minikube] context, using local docker daemon.
Building [skaffold-buildpacks-node]...
Target platforms: [linux/amd64]
v1: Pulling from buildpacks/builder
53e5e158da5a: Pulling fs layer
...
4f4fb700ef54: Pull complete
bf48dda771a3: Pull complete
dd67a8fdeda3: Pull complete
Digest: sha256:51cc3ed077978bd1f7720ac2d8b757f3311b271afc2ad4864956f919cde09ff6
Status: Downloaded newer image for gcr.io/buildpacks/builder:v1
panic.go:522: build [skaffold-buildpacks-node] failed: failed to fetch builder image 'gcr.io/buildpacks/builder:v1': No such image: gcr.io/buildpacks/builder:latest
--- FAIL: TestRun/buildpacks_NodeJS (19.34s)
```

2. [Test link](https://github.com/GoogleContainerTools/skaffold/actions/runs/5032829209/jobs/9026816475)
```
--- FAIL: TestDebug (16.26s)
/v2/integration/TestDebug/buildpacks
util.go:90: Assinged test TestDebug/buildpacks to partition: 3
helper.go:260: Running [skaffold build --default-repo us-central1-docker.pkg.dev/k8s-skaffold/testing --profile buildpacks] in testdata/debug
helper.go:260: skaffold build: exit status 1, Generating tags...
- skaffold-debug-java -> us-central1-docker.pkg.dev/k8s-skaffold/testing/skaffold-debug-java:test-v0.0.0-14-gf3671be56
- skaffold-debug-npm -> us-central1-docker.pkg.dev/k8s-skaffold/testing/skaffold-debug-npm:test-v0.0.0-14-gf3671be56
- skaffold-debug-nodejs -> us-central1-docker.pkg.dev/k8s-skaffold/testing/skaffold-debug-nodejs:test-v0.0.0-14-gf3671be56
- skaffold-debug-go -> us-central1-docker.pkg.dev/k8s-skaffold/testing/skaffold-debug-go:test-v0.0.0-14-gf3671be56
Checking cache...
- skaffold-debug-java: Not found. Building
- skaffold-debug-npm: Not found. Building
- skaffold-debug-nodejs: Not found. Building
- skaffold-debug-go: Not found. Building
Starting build...
Found [minikube] context, using local docker daemon.
...
Building [skaffold-debug-npm]...
Build [skaffold-debug-npm] was canceled
Building [skaffold-debug-java]...
Build [skaffold-debug-java] was canceled
Building [skaffold-debug-nodejs]...
Build [skaffold-debug-nodejs] was canceled
panic.go:522: failed to fetch builder image 'gcr.io/buildpacks/builder:v1': No such image: gcr.io/buildpacks/builder:latest
--- FAIL: TestDebug/buildpacks (16.26s)