Update comment redundant data plane adoption 'old' job names

We cannot remove the the 'old' data plane adoption jobs after the
job rename [1] because zuul checks all branches (e.g. ci-framework
has multiple branches referencing these jobs). This just updates the
comment to clarify that we will not be removing them.

[1] https://review.rdoproject.org/r/c/rdo-jobs/+/53788

Related: https://issues.redhat.com/browse/OSPRH-8452

zuul.d/adoption.yaml

@@ -95,7 +95,7 @@
                 ip: 172.20.0.100
                 config_nm: false
 
-# TODO(marios): remove this once we finish rename OSPRH-8452
+# NOTE(marios): need to keep this old job because of zuul branches, see comments at OSPRH-8452
 - job:
     name: cifmw-data-plane-adoption-osp-17-to-extracted-crc
     parent: adoption-standalone-to-crc-ceph-provider
@@ -166,7 +166,7 @@
       - tests?\/functional
       - zuul.d/molecule.*
 
-# TODO(marios): remove this once we finish rename OSPRH-8452
+# NOTE(marios): need to keep this old job because of zuul branches, see comments at OSPRH-8452
 - job:
     name: cifmw-data-plane-adoption-osp-17-to-extracted-crc-minimal-no-ceph
     parent: adoption-standalone-to-crc-no-ceph-provider