chore: replace GoogleCloudPlatform/spark-on-k8s-operator with kubeflow/spark-operator

[zevisert]

This is a naïve++ (as in, I did review each change) find and replace of the terms:

• GoogleCloudPlatform => kubeflow
• spark-on-k8s-operator => spark-operator
• GoogleCloudPlatform/spark-on-k8s-operator => kubeflow/spark-operator
• https://googlecloudplatform.github.io/spark-on-k8s-operator => https://kubeflow.github.io/spark-operator

⚠️ I didn't try building anything or running any tests! I just wanted to get something up so that the migration from gcp's repo is addressed sooner than later. I also didn't change any documentation or anything.

• I also didn't update the ghcr.io references, that can be done in a PR for Update Release Workflows: Change Container Registry to Kubeflow's ghcr.io #1930

Ref: #1929

[yuchaoran2011]

@zevisert Could you fix the DCO error as indicated in https://github.com/kubeflow/spark-operator/pull/1937/checks?check_run_id=22904525714?

[zevisert]

@yuchaoran2011, my commit message has been amended

[yuchaoran2011]

@zevisert Thanks. Please also fix the merge conflicts

[zevisert]

@yuchaoran2011 Done

[zevisert]

Actually, I rebased on master and found one more reference, I need one more commit

[yuchaoran2011]

/lgtm

[google-oss-prow]

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[vara-bonthu]

@zevisert Thanks for the PR! I noticed changes to Go files. Could you please confirm if you've had a chance to test those changes? If not, we could create an issue to validate and we can also look at addressing our e2e tests?

[zevisert]

@vara-bonthu No, I tried to make that clear in the description; this was just a find and replace. Were there no tests run as part of this PR?

[vzhao12]

This pr breaks all old images pull because in https://github.com/kubeflow/spark-operator/pkgs/container/spark-operator. There is no old version image available at all. Can you revert this pr or copy all image to the new place? Thanks

[vzhao12]

Please see the issue here. I don't think I will be the only one who has this issue.

[zevisert]

@vzhao12 - I purposely didn't change the repository in this PR so as to not create issues like this. PR #1956 and PR #1974 have both changed the chart repository, but this PR did not.