kubectl ko performance enhance (#2975)

[changluyi]

• kubectl ko performance enhance

1. add result format
2. add gc
3. add svc performance test
4. add diagnose to node port

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

What type of this PR

Examples of user facing changes:

• Features
• Bug fixes
• Docs
• Tests

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at 57beabd

This pull request enhances the pinger tool and package to support custom target IP and port pairs for connectivity check. It adds a new flag --target-ip-ports to the tool and modifies the pinger package to handle it. It also fixes some minor typos in the logs.

🤖 Generated by Copilot at 57beabd

pinger can test
multiple IP and ports
autumn of typos

HOW

🤖 Generated by Copilot at 57beabd

• Add a new field TargetIPPorts to the Configuration struct and a new flag --target-ip-ports to the ParseFlags function to store and parse the user-specified target protocol, IP and port for connectivity check (link, link, link)
• Implement a new function checkAccessTargetIPPorts in ping.go to perform the connectivity check for the target protocol, IP and port using the TCPConnectivityCheck or UDPConnectivityCheck function from the util package, and log the result or error of each check (link)
• Call the checkAccessTargetIPPorts function from the ping function if the TargetIPPorts field is not empty, and set the errHappens variable to true if the function returns an error (link)
• Fix typos in the log messages of the pingNodes and pingPods functions, changing "connnectivity" to "connectivity" (link, link)
• Import the kubeovnv1 package in ping.go to use the constants and types for the kube-ovn API, such as ProtocolIPv6 (link)