some fixes in e2e

[zhangzujian]

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

What type of this PR

• Tests

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at c52f15b

Add namespace support to various e2e testing framework components and improve event message checks and subnet status updates in the e2e tests and controller.

🤖 Generated by Copilot at c52f15b

We're testing the network in different namespaces
We're creating and managing resources with ease
We're quoting the values and checking the events
Heave away, me code-ies, heave away

HOW

🤖 Generated by Copilot at c52f15b

• Extend various resource client types with a namespace field to store the namespace of the resources (link, link, link, link, link, link, link, link, link)
• Modify the corresponding constructor functions to assign the namespace field with the given namespace parameter (link, link, link, link, link, link, link, link, link)
• Use the namespace field instead of the framework namespace to filter or wait for the resources in the WaitToHaveEvent, WaitForRunning, and WaitForNotFound functions (link, link)
• Modify the event messages for subnet gateway type and node changes to use %q instead of %s to quote the values and avoid confusion with spaces or special characters (link)
• Modify the tests for subnet gateway type and node changes to use %q instead of %s to match the event message format and use exact equality instead of substring containment to check the event message (link, link)
• Add the waitSubnetStatusUpdate function to the underlay package to wait for the subnet status to reflect the expected number of using IPs in the given namespace (link)
• Call the waitSubnetStatusUpdate function in various tests for pod IP allocation in the underlay mode to verify that the subnet status is updated correctly after creating or deleting pods in different subnets, nodes, or annotations (link, link, link, link, link, link, link, link, link)