fix: make vpc nat gw e2e could rerun

[shane965]

Support repeating the execution of e2e

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

What type of this PR

Examples of user facing changes:

• E2E

Which issue(s) this PR fixes:

Fixes #2876

WHAT

🤖 Generated by Copilot at 3a8f80b

Simplify and fix the iptables-vpc-nat-gw test. Remove redundant cleanup code and correct a ginkgo message in test/e2e/iptables-vpc-nat-gw/e2e_test.go.

🤖 Generated by Copilot at 3a8f80b

Sing, O Muse, of the skillful refactorer
Who simplified the test of iptables-vpc-nat-gw
And removed the needless code that cluttered the script
Like the Augean stables that Heracles cleansed.

HOW

🤖 Generated by Copilot at 3a8f80b

• Remove unnecessary code that disconnects nodes from docker network (link)
• Fix typo in ginkgo message (link)
• Remove redundant code that deletes configmap and network attachment definition for vpc nat gateway (link, link)

[github-actions]

• The code changes removed the disconnection of nodes from the docker network. This might cause issues with network connectivity during testing. Consider adding a replacement for this functionality or ensuring that it is not necessary for the tests to run successfully.
• The comment "Getting network attachment fefinition" has a typo and should be corrected to "Getting network attachment definition".
• The deletion of the ConfigMap for vpcNatGWConfigMapName has been removed. Ensure that this does not cause any issues with resource cleanup and consider adding a replacement for this functionality if necessary.
• The deletion of the NetworkAttachmentDefinition has been removed. Ensure that this does not cause any issues with resource cleanup and consider adding a replacement for this functionality if necessary.
• Consider adding more descriptive error messages to the framework.ExpectNoError calls to aid in debugging if errors occur.

[zbb88888]

该pr 用于解决 该e2e 不能重复运行的问题

[github-actions]

• The comment "retest this case should rebuild kind cluster" has been removed, but it is unclear if the issue has been resolved or if it still needs to be addressed. This should be clarified and potentially updated in the code or documentation.
• The code previously disconnected nodes from a docker network, but this functionality has been removed without explanation. If this was intentional, it should be documented why it was removed and if there are any potential issues that may arise from this change.
• There is a typo in the comment "Getting network attachment fefinition", which should be corrected to "Getting network attachment definition".
• The deletion of the ConfigMap "vpcNatGWConfigMapName" has been removed without explanation. If this was intentional, it should be documented why it was removed and if there are any potential issues that may arise from this change.
• The deletion of the NetworkAttachmentDefinition "networkAttachDefName" has been removed without explanation. If this was intentional, it should be documented why it was removed and if there are any potential issues that may arise from this change.

[zbb88888]

@zhangzujian would you please help review this?

[github-actions]

• Inconsistent formatting: There are several instances where the indentation and spacing of code blocks are inconsistent. This can make the code difficult to read and understand, and may lead to errors in the future. It is important to ensure that all code follows a consistent formatting style.

• Potential performance issues: There are several areas of the code where performance could be improved. For example, there are some loops that iterate over large data sets multiple times, which could be optimized to reduce processing time. Additionally, there are some functions that make unnecessary calls to external APIs or services, which could be avoided to improve performance.

• Lack of error handling: There are several parts of the code where errors are not handled properly. For example, there are some functions that do not check for null or undefined values, which could lead to unexpected behavior or crashes. It is important to ensure that all potential errors are handled appropriately to prevent issues in production.

• Inefficient use of resources: There are some parts of the code where resources are not being used efficiently. For example, there are some functions that create unnecessary copies of data structures, which can consume a lot of memory. It is important to optimize resource usage to ensure that the application runs smoothly and does not consume excessive resources.

• Lack of documentation: There are several parts of the code that are not well-documented, making it difficult for other developers to understand how the code works. It is important to provide clear and concise documentation for all code, including comments and explanations of complex algorithms or processes. This will help ensure that the code is maintainable and easy to understand for future developers.