🐛 Skip custom mutation handler when delete a CR

[iiiceoo]

Signed-off-by: iiiceoo <ziqian.xue@daocloud.io>

closes #2048

Mutating webhook registered by func WithDefaulter() returns an error "there is no content to decode" when processing CR deletion request. Refer to the solution here, add the same logic to the handler of the interface CustomDefaulter.

[linux-foundation-easycla]

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/ok-to-test

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/lgtm
/cc @alvaroaleman

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