fix ovn nat not clean

[bobz965]

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

What type of this PR

• Bug fixes

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at 3b5d53e

This pull request refactors and improves the controller code for handling ovn dnat, fip, and snat events. It removes unnecessary code, reduces logging verbosity, and optimizes performance by avoiding extra lookups. It also makes the logging messages more consistent and visible across the different files.

🤖 Generated by Copilot at 3b5d53e

We're haulin' on the ropes of the ovn code
We're makin' it more simple and more fast
We're loggin' and we're handlin' the dnat and the snat
We're workin' as a team to raise the mast

HOW

🤖 Generated by Copilot at 3b5d53e

• Simplify and refactor the code that handles deletion events for ovn dnat, fip, and snat rules, by passing the object instead of the key and removing unnecessary checks and error handling (link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Change the logging level of several messages from 3 to the default level, to make them more visible and consistent with other similar messages in ovn_dnat.go, ovn_fip.go, and ovn_snat.go (link, link, link, link, link, link, link, link, link, link, link)