fix: wrong usage about DeepEqual

[bobz965]

Pull Request

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

What type of this PR

Examples of user facing changes:

• Bug fixes

Which issue(s) this PR fixes

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at 8c187db

This pull request improves the performance and readability of the code that handles external gateway nodes, OvnEip, OvnFip, and Vpc resources in the pkg/controller package. It removes unnecessary dependencies on the reflect package and simplifies object comparison logic.

🤖 Generated by Copilot at 8c187db

This pull request has some changes
To improve how the code manages
Vpc, OvnEip, and OvnFip
And external gateway nodes that slip
By using less reflect and more ranges

HOW

🤖 Generated by Copilot at 8c187db

• Simplify the comparison of old and new objects in the enqueueUpdateOvnEip, enqueueUpdateOvnFip, and enqueueUpdateVpc functions by using direct equality checks instead of reflect.DeepEqual calls for simple string and boolean fields. This improves the performance and readability of the code. (link, link, link)
• Remove the unused reflect package import from the ovn_eip.go and ovn_fip.go files, following the best practice of removing unnecessary dependencies. (link, link)
• Refactor the logic in the getGatewayChassis function in external_gw.go to use a loop to trim and append the node names from the external-gw-nodes config, instead of using a single strings.Split call. This avoids potential issues with empty or extra spaces in the node names, and makes the code more consistent with other similar functions. (link)