GITHUB-ISSUE-1810: Fix newline in last set filename

[dcaputo-harmoni]

Also includes minor change to "s3" reference in collector logging (changed to "storage") because the push applies to all storage types. See github issue 1810 for details on the newline issue that is addressed in this commit.

[CLAassistant]

All committers have signed the CLA.

[dcaputo-harmoni]

Fixes #1810

[egegunes]

@dcaputo-harmoni thank you for your contribution.

@inelpandzic could you please review as well?

[JNKPercona]

Test name	Status
affinity-8-0	passed
auto-tuning-8-0	passed
cross-site-8-0	passed
demand-backup-cloud-8-0	passed
demand-backup-encrypted-with-tls-8-0	passed
demand-backup-8-0	passed
haproxy-5-7	passed
haproxy-8-0	passed
init-deploy-5-7	passed
init-deploy-8-0	passed
limits-8-0	passed
monitoring-2-0-8-0	passed
one-pod-5-7	passed
one-pod-8-0	passed
pitr-8-0	passed
pitr-gap-errors-8-0	passed
proxy-protocol-8-0	passed
proxysql-sidecar-res-limits-8-0	passed
pvc-resize-5-7	passed
pvc-resize-8-0	passed
recreate-8-0	passed
restore-to-encrypted-cluster-8-0	passed
scaling-proxysql-8-0	passed
scaling-8-0	passed
scheduled-backup-5-7	passed
scheduled-backup-8-0	passed
security-context-8-0	passed
smart-update1-8-0	passed
smart-update2-8-0	passed
storage-8-0	passed
tls-issue-cert-manager-ref-8-0	passed
tls-issue-cert-manager-8-0	passed
tls-issue-self-8-0	passed
upgrade-consistency-8-0	passed
upgrade-haproxy-5-7	passed
upgrade-haproxy-8-0	passed
upgrade-proxysql-5-7	passed
upgrade-proxysql-8-0	passed
users-5-7	passed
users-8-0	passed
validation-hook-8-0	passed
We run 41 out of 41

commit: fd7d230
image: perconalab/percona-xtradb-cluster-operator:PR-1811-fd7d230e

[hors]

@dcaputo-harmoni Thank you for contribution. We will include this fix in the next PXCO release.