Revert "nm not managed only in the change provide nic name case (#2754)"

[zhangzujian]

This reverts commit c77f368.

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

• Bug fixes

Which issue(s) this PR fixes:

Revert #2754

We still need to set underlay links unmanaged by NetworkManager since in some scenarios, some routes on the underlay link cannot be cleaned if the link is managed by NetworkManager.

Now it's safe to set the link unmanaged by NetworkManager, because:

1. After the node reboots, start-ovs.sh removes all OVS bridges used in underlay networking;
2. kube-ovn-cni waits ovs-vswitchd to be running before it starts.

WHAT

🤖 Generated by Copilot at e16f8d2

This pull request improves logging and network stability for the OVS daemon. It removes redundant log messages in init.go and prevents NetworkManager from managing the provider nic in ovs_linux.go.

🤖 Generated by Copilot at e16f8d2

Sing, O Muse, of the mighty pull request
That the skilled coder sent to his peers
To improve the network of the pods sublime
With OVS and the provider nic.

HOW

🤖 Generated by Copilot at e16f8d2

• Remove redundant log messages that print the same information as the previous line (link, link) in init.go