Fix Rollouts plugin location URL format (master branch)

[jgwest]

What type of PR is this?
/kind bug

What does this PR do / why we need it:

When using pre-release builds, when you create an Argo Rollouts (install by creating a RolloutManager CR) the Rollouts Pod that is created will fail to start.

If you look at the Pods logs for the Rollout controller, you will see the following error:

[jgw@localhost-lan rollouts-plugin-trafficrouter-openshift]$ k logs pod/argo-rollouts-7bcddf67cf-hl8ph
time="2024-06-10T12:46:22Z" level=info msg="Argo Rollouts starting" version=vstable+737ca89
time="2024-06-10T12:46:22Z" level=info msg="Creating event broadcaster"
time="2024-06-10T12:46:22Z" level=info msg="Setting up event handlers"
time="2024-06-10T12:46:22Z" level=info msg="Setting up experiments event handlers"
time="2024-06-10T12:46:22Z" level=info msg="Setting up analysis event handlers"
time="2024-06-10T12:46:22Z" level=fatal msg="Failed to download plugins: plugin location must be of http(s) or file scheme"

The fix is a one line change to gitops-operator. The ConfigMap that is generated SHOUD contain this:

  trafficRouterPlugins: |
    - name: argoproj-labs/openshift
      location: file:/plugins/rollouts-trafficrouter-openshift/openshift-route-plugin
      sha256: ""

[openshift-ci]

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[jgwest]

Red Hat Issue Tracker: https://issues.redhat.com/browse/GITOPS-4815

[jgwest]

/retest

cluster flake

[jgwest]

LGTM by Anand on the other PR