KEP-4322: Fix terminology inconsistency by replacing "management cluster" with "hub cluster"

[kahirokunn]

KEP-4322: Fix terminology inconsistency by replacing "management cluster" with "hub cluster"

• One-line PR description: Fix terminology inconsistency in the Pull Model with Work API section

• Other comments:
  This PR fixes terminology inconsistency found in the "Pull Model with Work API" section.
  The document consistently uses "hub cluster" throughout, but there were two instances
  where "management cluster" was used instead. This change ensures consistent terminology
  across the entire KEP document.

[k8s-ci-robot]

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[kahirokunn]

Hi @corentone,

I noticed a terminology inconsistency in the "Pull Model with Work API" section where "management cluster" was used instead of "hub cluster". This PR fixes those two instances to maintain consistency throughout the KEP document.

Could you please review this change when you have a chance?

Thank you!