ci(emailsender): optimize compatibility test

[kovayur]

Description

Emailsender compatibility tests fail with no disk space on a GH runner.

Test on kind cluster
System.IO.IOException: No space left on device ...

Example: https://github.com/stackrox/acs-fleet-manager/actions/runs/20276467065

Changes

• Do not clone stackrox when running against acs-fleet-manager
• Use roxctl from the main image instead of building it.

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.
• Add secret to app-interface Vault or Secrets Manager if necessary
• RDS changes were e2e tested manually
• Check AWS limits are reasonable for changes provisioning new resources

Test manual

TODO: Add manual testing efforts

# To run tests locally run:
make db/teardown db/setup db/migrate
make ocm/setup
make verify lint binary test test/integration

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johannes94, kovayur

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[kovayur]

stackrox tested here: stackrox/stackrox#18321