register cluster install karmada-agent should set leader-elect-resouce-namespace

[yanfeng1992]

What type of PR is this?

/kind bug

What this PR does / why we need it:

karmada agent deployment namespace and leader-elect-resouce-namespace should be consistent

now we install karmada agent in a new namespace, but leader-elect-resouce-namespace is karmada-system

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmadactl`:  Register cluster install karmada-agent should set leader-elect-resouce-namespace.

[yanfeng1992]

/assign @chaunceyjiang

[XiShanYongYe-Chang]

Hi @yanfeng1992 can you help add a release note?

[yanfeng1992]

Hi @yanfeng1992 can you help add a release note?

done

[chaunceyjiang]

Thanks~

/lgtm

[XiShanYongYe-Chang]

/lgtm

Ask @lonelyCZ or @chaunceyjiang to approve this patch.

[XiShanYongYe-Chang]

/cc @chaunceyjiang @RainbowMango

[chaunceyjiang]

Thanks~

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chaunceyjiang

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[XiShanYongYe-Chang]

Hi @yanfeng1992, do you think we need to cherry-pick this patch to the previous branch?

[yanfeng1992]

Hi @yanfeng1992, do you think we need to cherry-pick this patch to the previous branch?

I don't think it's necessary, the problem doesn't seem that serious