remove creationTimestamp line

[Linchin]

Which issue is resolved by this Pull Request:
Resolves kubeflow/kubeflow#7041, GoogleCloudPlatform/kubeflow-distribution#431

Description of your changes:
When deploying KF 1.7 on GCP, this line,

creationTimestamp: null

caused the following error in deployment:

error: unable to decode "apps/profiles/build/apiextensions.k8s.io_v1_customresourcedefinition_profiles.kubeflow.org.yaml": parsing time "null" as "2006-01-02T15:04:05Z07:00": cannot parse "null" as "2006"

This seems to be due to golang being unable to handle null when unmarshalling timestamp. Currently, users have to manually remove this line every time for the deployment to succeed.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Linchin
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[juliusvonkohout]

/lgtm

[Linchin]

/assign @kimwnasptd

[Linchin]

/assign @yanniszark

[juliusvonkohout]

Most of our approvers have left the project. I think only Kimonas is left. I'll try to be able to approve such stuff in the future, but it will probably take a few months to become approver. Maybe join the notebooks WG or manifest WG meeting.

[Linchin]

Thank you @juliusvonkohout for explaining the situation! I have also messaged Kimonas on slack.

[zijianjoy]

@DnPlas is the release manager for this coming Kubeflow release, so tagging here to increase visibility.

Let's make the change in https://github.com/kubeflow/kubeflow/blob/master/components/profile-controller/config/crd/bases/kubeflow.org_profiles.yaml#L7 which is the upstream of this file.

[Linchin]

Thank you @zijianjoy, I will create a PR over there.