Symbol links of key and cert are no longer used.

[xiangpengzhao]

What this PR does / why we need it:
This is unused for current cycle.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
ref #42660

Special notes for your reviewer:
/cc @mikedanese

Release note:

NONE

[mikedanese]

/lgtm
/approve

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mikedanese, xiangpengzhao

Associated issue: 42660

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these OWNERS Files:

• cluster/gce/OWNERS [mikedanese]

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[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 55265, 54092, 55353, 53733, 55385). If you want to cherry-pick this change to another branch, please follow the instructions here.