Add init container to e2e template for SAPM image gate

[dustman9000]

Summary

Adds an init container to the osde2e focused test Job template that references the test image (${TEST_IMAGE}:${IMAGE_TAG}). This makes the image visible to qontract-reconcile's _collect_images scanner, which validates all container images exist before deploying.

Problem

The test image reference is embedded in a YAML string inside the TEST_SUITES_YAML env var. The _collect_images scanner only checks spec.template.spec.containers[].image and initContainers[].image, so it never finds the test image.

When SAPM auto-promotes the e2e saas file after a PKO deploy, the e2e Job deploys before the Konflux release pipeline finishes pushing the test image to the production registry, causing manifest unknown errors.

Fix

The init container runs true and exits immediately. Its only purpose is to surface the test image reference as a proper container image field so the SAPM image check blocks deployment until the image exists.

Benefits all operators using the golang-osd-e2e boilerplate convention.

[coderabbitai]

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[dustman9000]

/hold for testing

[joshbranham]

This lgtm as a interim step to prevent flakes in e2e's. I presumed we had a better way to do this in Tekton + App-Interface, but as discussed on Slack, we've exhausted steps there.

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dustman9000, joshbranham

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