Addressed issues

Issues addressed in the MKE 3.7.15 release include:

• [FIELD-7209] Fixed an issue wherein empty kubelet flags were added to the ucp-kubelet container following the restart to apply a kubelet profile.

• [FIELD-7153] Fixed an issue wherein upgrades to MKE 3.7.12 failed on Swarm-only mode at the pre-upgrade check.

• [FIELD-7044] Fixed an issue wherein in rare cases the k8s service fails to work on Windows nodes.