move unnecessary init process after startWorkers

[hongzhen-ma]

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

What type of this PR

• Improvement

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

🤖 Generated by Copilot at 96dc92c

Refactor controller Run function, simplify logical switch port garbage collection, and enhance code readability in init.go.

🤖 Generated by Copilot at 96dc92c

Sing, O Muse, of the mighty controller, who rules the network
With swift and skillful logic, and refines his code with care.
He splits his Run function, and entrusts the resource init
To a helper, who performs it once, and guards it with a sync.

HOW

🤖 Generated by Copilot at 96dc92c

• Refactor the Run function of the controller to separate the initialization of resources that affect the controller process from those that do not (link, link, link, link, link, link)
• Move the initialization of node chassis, security groups, load balancers, vpc nat gateways, and vpc dns configs to a new function initResourceOnce in controller.go (link, link, link, link)
• Call initResourceOnce after the workers start, using a sync.Once variable to ensure it is only executed once (link, link)
• Add a comment to explain the rationale of the refactoring (link)
• Simplify the garbage collection of unused resources in the ovn database by removing the logical switch port gc from the gc function in gc.go (link, link)
  • Delete the unused gcLogicalSwitchPort function from gc.go (link)
  • Rely on the existing markAndCleanLSP function, which is called periodically by a ticker, to handle the logical switch port gc (link)
• Add empty lines to init.go for formatting purposes (link, link)