Update testing-manifests/storage-csi owners file

[xing-yang]

What type of PR is this?
/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #

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Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[xing-yang]

/assign @msau42

[msau42]

/lgtm
/approve

[msau42]

/retest

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, xing-yang

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