feat(admission-controller): simplify CA and certificate options #1246
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What this PR does / why we need it:
As discussed internally, there are no known requests to provide custom certificates or CA for the internal webhook, as it is automatically generated and the right CA bundle is provided on registration.
Moreover, the current implementation mixes CA certificate for trust with internal TLS certificate generation, which is not right. CA key should not be provided to the Helm chart
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