refactor: simplify managed fields upgrade

[erikgb]

/hold

[jetstack-bot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[jetstack-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from erikgb. For more information see the Kubernetes Code Review Process.

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[erikgb]

/test all

[erikgb]

/unhold /cc @inteon

[erikgb]

/test pull-trust-manager-verify

[inteon]

Thanks @erikgb. Great work upstreaming support for sub-resources. /approve /lgtm

[cert-manager-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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• ~~OWNERS~~ [inteon]

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