Remove valkey_sentinel container prefix exception

[seunghun1ee]

The fix for K-A bug LP#2161716 [1] has backported to 2026.1 [2].

[1] https://bugs.launchpad.net/kolla-ansible/+bug/2161716
[2] https://review.opendev.org/c/openstack/kolla-ansible/+/998759

Summary by CodeRabbit

• Bug Fixes
  • Corrected tag resolution for the Valkey Sentinel container so it now follows the standard default hierarchy.

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