docs: Automated CherryPick Update for release-v4.4

[sealos-ci-robot]

🤖 Generated by Copilot at 51a4c11

Summary

🗑️🔀🛠️

Removed SendNewCertAndKeyToMasters method from KubeadmRuntime struct. Simplified certificate distribution logic by using sealos join command.

SendNewCertAndKey
Moved to sealos join command
No more duplication

Walkthrough

• Remove SendNewCertAndKeyToMasters method from KubeadmRuntime struct (link)

Automated changes by create-pull-request GitHub action

[sealos-ci-robot]

/cherry-pick release-v4.3

[sealos-ci-robot]

🤖 says: Error cherry-picking.

Auto-merging pkg/runtime/init.go
CONFLICT (content): Merge conflict in pkg/runtime/init.go
error: could not apply cb75187... fix(main): delete clean_unused_func (#4017) (#4018)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

[sealos-ci-robot]

🤖 says: ‼️ cherry pick action failed.
See: https://github.com/labring/sealos/actions/runs/6346041632