5elf

fix: Omit optional fields explicitly

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### What problem does this PR solve? close #3526 ### What's changed and how it works? Add missing `omitempty` JSON tag to optional fields. ### Related changes - [ ]...

status.conditions.reason: Invalid value: \"null\"

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## Bug Report **What version of Kubernetes are you using?** Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.1", GitCommit:"5e58841cce77d4bc13713ad2b91fa0d961e69192", GitTreeState:"clean", BuildDate:"2021-05-12T14:18:45Z", GoVersion:"go1.16.4", Compiler:"gc", Platform:"darwin/amd64"} Server Version: version.Info{Major:"1", Minor:"18+", GitVersion:"v1.18.10-468+23b6e83f628328-dirty", GitCommit:"23b6e83f6283287ee0674953488b478ab6a740f7", GitTreeState:"dirty", BuildDate:"2022-06-13T06:58:27Z", GoVersion:"go1.17.3",...