chore(manifests): remove "localhost" from kfp-api-cert

[Sayan4496]

Fixes #12720

Removed "localhost" from kfp-api-cert dnsNames list to avoid insecure/non-standard certificate SAN configuration.

[google-oss-prow]

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[google-oss-prow]

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[Sayan4496]

It looks like this issue has already been addressed in #12718.
Closing this PR to avoid duplicate work. Thanks!