NO-JIRA: fix CMO config for Alertmanager e2e tests

[simonpasquier]

From https://github.com/openshift/cluster-monitoring-operator/pull/2493#discussion_r1801187426

• [ ] I added CHANGELOG entry for this change.
• [ ] No user facing changes, so no entry in CHANGELOG was needed.

[openshift-ci-robot]

@simonpasquier: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2495): >From https://github.com/openshift/cluster-monitoring-operator/pull/2493#discussion_r1801187426 > > >* [ ] I added CHANGELOG entry for this change. >* [ ] No user facing changes, so no entry in CHANGELOG was needed. > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[machine424]

/lgtm thanks.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: machine424, simonpasquier

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[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: cluster-monitoring-operator This PR has been included in build cluster-monitoring-operator-container-v4.18.0-202410151810.p0.g214adad.assembly.stream.el9. All builds following this will include this PR.