Remove direct dependency on k8s.io/kubernetes

[xing-yang]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This PR removes direct dependency on kubernetes which is not recommended.
Copied https://github.com/kubernetes/kubernetes/blob/v1.29.0-alpha.0/pkg/apis/admission/fuzzer/fuzzer.go to external-snapshotter so that we can get rid of the direct dependency on k8s.io/kubernetes.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Getting the following errors when generating release notes:

INFO Setting up repository github.com/kubernetes-csi/external-snapshotter  file="modiff/modiff.go:59"
INFO Retrieving modules of fcb21dc5b138e87e8dc16ed49d5215d896d1ceea  file="modiff/modiff.go:230"
INFO Retrieving modules of bb29899ca37369fe7c3bc3c861d3186b50e2fc65  file="modiff/modiff.go:230"
ERRO unable to run cmd: go list -mod=readonly -m all, workdir: /tmp/go-modiff331102065, stdout: , stderr: go: k8s.io/[email protected]: invalid version: unknown revision v0.0.0
, error: exit status 1  file="modiff/modiff.go:251"
FATA generating dependency report: getting dependency changes: unable to run cmd: go list -mod=readonly -m all, workdir: /tmp/go-modiff331102065, stdout: , stderr: go: k8s.io/[email protected]: invalid version: unknown revision v0.0.0
, error: exit status 1  file="release-notes/main.go:390"

According to the following issue, depending on kubernetes directly will cause this problem.
kubernetes/kubernetes#79384

Does this PR introduce a user-facing change?:

NONE

[xing-yang]

/assign @msau42

[msau42]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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