Update cluster architecture diagram

[Nezz7]

Description

• Changed the direction of the arrow between kube-api-server and etcd
  from etcd -> kube-api-server to kube-api-server -> etcd.

Issue

#48500

Closes: #

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[sftim]

Thanks. I see there is also a change to the labels; could you update the description to match?

/retitle Update cluster architecture diagram

[Nezz7]

I tried to change Controller Manager to controller manager to match other components style.
But somehow it didn't show up...
I will try to fix it.

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PR needs rebase.

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