Exclude images on app.ci to workaround ComparisonError

[liangxia]

We have below error on app.ci in ArgoCD,

ComparisonError:
 Failed to load live state:
  failed to get cluster info for "https://api_url_of_appci:6443":
   error synchronizing cache state :
    failed to sync cluster https://api_url_of_appci:6443:
     failed to load initial state of resource Image.image.openshift.io:
      failed to list resources:
       The provided continue parameter is too old to display a consistent list result.
       You can start a new list without the continue parameter, or use the continue token in this response to retrieve the remainder of the results.
       Continuing with the provided token results in an inconsistent list - objects that were created, modified, or deleted between the time the first chunk was returned and now may show up in the list.;
ComparisonError:
 Failed to load target state:
  failed to get cluster version for cluster "https://api_url_of_appci:6443":
   failed to get cluster info for "https://api_url_of_appci:6443":
    error synchronizing cache state :
     failed to sync cluster https://api_url_of_appci:6443:
      failed to load initial state of resource Image.image.openshift.io:
       failed to list resources:
        The provided continue parameter is too old to display a consistent list result.
        You can start a new list without the continue parameter, or use the continue token in this response to retrieve the remainder of the results.
        Continuing with the provided token results in an inconsistent list - objects that were created, modified, or deleted between the time the first chunk was returned and now may show up in the list.

which is exactly the same issue as argoproj/argo-cd#6113
The issue can be reproduced with oc --context app.ci get image -A.
The root cause is too many image resources and API can not return the list in a reasonable time.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@liangxia: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci]

@liangxia: all tests passed!

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[liangxia]

/cc @openshift/test-platform

[joepvd]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joepvd, liangxia

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