[pcp_metrics] Fix broken hosts selection

[michburk]

Because cifmw_pcp_metrics_hosts was defined in the pcp_metrics role's defaults file, the pcp-metrics-pre.yml playbook was trying to use this var before it was imported, leading to 'cifmw_pcp_metrics_hosts' is undefined errors

[rebtoor]

thanks @michburk , i definitely missed it!

[rebtoor]

/lgtm
/approve

[openshift-ci]

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[michburk]

thanks @michburk , i definitely missed it!

To be fair, I also missed this when reviewing the pr 😅

[michburk]

Tested and working downstream in testproject 2296

PLAY [Start collecting performance metrics] ************************************

TASK [Setup PCP name=pcp_metrics, tasks_from=setup] ****************************
Wednesday 13 May 2026  15:47:59 +0000 (0:00:00.542)       0:00:02.711 *********
Wednesday 13 May 2026  15:47:59 +0000 (0:00:00.542)       0:00:02.710 *********

TASK [pcp_metrics : Install PCP name={{ pcp_metrics_packages }}, state=present, use=ansible.builtin.dnf] ***
Wednesday 13 May 2026  15:47:59 +0000 (0:00:00.093)       0:00:02.804 *********
Wednesday 13 May 2026  15:47:59 +0000 (0:00:00.093)       0:00:02.803 *********
changed: [ocp-master-2]
changed: [ocp-master-0]
changed: [ocp-master-1]
changed: [controller-0]
ok: [hypervisor]
changed: [compute-94-b34mesey-0]
changed: [compute-96-b34mesey-0]