Helm tests fail on release tag

[kate-osborn]

Describe the bug
The helm tests fail on release tag pipelines trying to load multiple docker images onto the kind cluster:

kind load docker-image ghcr.io/nginxinc/nginx-gateway-fabric:1.0.0
ghcr.io/nginxinc/nginx-gateway-fabric:latest ghcr.io/nginxinc/nginx-gateway-fabric/nginx:1.0.0
ghcr.io/nginxinc/nginx-gateway-fabric/nginx:latest

error:

Image: "ghcr.io/nginxinc/nginx-gateway-fabric:1.0.0" with ID "sha256:c3bcd92b94503b16b896f9963234996b1edfa5814debb6eace0ff5f53ba17cb6" not yet present on node "kind-control-plane", loading...
/home/runner/work/_temp/2f2c899c-8a58-460f-9706-1fb7b8f55594.sh: line 5: ghcr.io/nginxinc/nginx-gateway-fabric:latest: No such file or directory

It is possible to load multiple images in one command but the images must be separated by a space, not a newline:

kind load docker-image ghcr.io/nginxinc/nginx-gateway-fabric:1.0.0 ghcr.io/nginxinc/nginx-gateway-fabric:latest ghcr.io/nginxinc/nginx-gateway-fabric/nginx:1.0.0 ghcr.io/nginxinc/nginx-gateway-fabric/nginx:latest

Expected behavior
Helm tests pass on release tag pipelines

Pipeline failure for v1.0.0: https://github.com/nginxinc/nginx-gateway-fabric/actions/runs/6631103099/job/18014209953

[sjberman]

Another issue that affects both this workflow and the conformance test workflow is when we access steps.ngf-meta.outputs.tags, it contains both elements, and the cut command fails because of this. Seems like the job passes anyway.

Doesn't seem like we need the latest image at all, maybe we can update the meta jobs in both workflows to not include latest.