Do not process pod marked for deletion

[dciabrin]

During pod inspection to check whether a galera server can be started either in bootstrap or joiner mode, do not consider pod if it is marked for deletion.

Jira: OSPRH-30959

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dciabrin, lmiccini

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[openshift-ci]

@dciabrin: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/mariadb-operator-build-deploy-chainsaw	3c37e35	link	unknown	/test mariadb-operator-build-deploy-chainsaw

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