chore: cleanup deprecated extension yaml

[guqing]

What type of PR is this?

/kind cleanup /area core /milestone 2.17.x

What this PR does / why we need it:

清理已经过时很久的 yaml extension 声明

Does this PR introduce a user-facing change?

None

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.06%. Comparing base (bc10336) to head (fcfda58). Report is 55 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6245 +/- ## ============================================ + Coverage 54.51% 58.06% +3.55% - Complexity 3523 3757 +234 ============================================ Files 646 648 +2 Lines 21862 22014 +152 Branches 1528 1547 +19 ============================================ + Hits 11917 12783 +866 + Misses 9328 8612 -716 - Partials 617 619 +2 ```

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[f2c-ci-robot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/halo-dev/halo/blob/main/OWNERS)~~ [JohnNiang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[JohnNiang]

/milestone 2.18.x