Add a BaseWebhook that replaces all kubeflow webhooks

[alculquicondor]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Introduce a BaseWebhook that can be used as-is for most job integrations. This removes a lot of repeated code for kubeflow.

Which issue(s) this PR fixes:

I did this in preparation for #2878
It can also justify the removal of integration tests for most kubeflow jobs #2993

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Add a jobframework.BaseWebhook that can be used for custom job integrations

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alculquicondor

The full list of commands accepted by this bot can be found here.

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• pkg/controller/OWNERS [alculquicondor]

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[tenzen-y]

Thanks!
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 313e1f5f3a611c46ce7521e4083f8aa89ee30b5c

[mbobrovskyi]

/cherry-pick release-0.8

[k8s-infra-cherrypick-robot]

@mbobrovskyi: #3102 failed to apply on top of branch "release-0.8":

Applying: Add a BaseWebhook that replaces all kubeflow webhooks
Using index info to reconstruct a base tree...
M	pkg/controller/jobs/kubeflow/jobs/mxjob/mxjob_controller.go
M	pkg/controller/jobs/kubeflow/jobs/paddlejob/paddlejob_controller.go
M	pkg/controller/jobs/kubeflow/jobs/pytorchjob/pytorchjob_controller.go
M	pkg/controller/jobs/kubeflow/jobs/tfjob/tfjob_controller.go
M	pkg/controller/jobs/kubeflow/jobs/xgboostjob/xgboostjob_controller.go
M	pkg/controller/jobs/mpijob/mpijob_controller.go
M	pkg/controller/jobs/mpijob/mpijob_webhook.go
M	pkg/controller/jobs/mpijob/mpijob_webhook_test.go
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): pkg/controller/jobs/mpijob/mpijob_webhook.go deleted in Add a BaseWebhook that replaces all kubeflow webhooks and modified in HEAD. Version HEAD of pkg/controller/jobs/mpijob/mpijob_webhook.go left in tree.
Auto-merging pkg/controller/jobs/mpijob/mpijob_controller.go
CONFLICT (content): Merge conflict in pkg/controller/jobs/mpijob/mpijob_controller.go
Removing pkg/controller/jobs/kubeflow/jobs/xgboostjob/xgboostjob_webhook_test.go
Removing pkg/controller/jobs/kubeflow/jobs/xgboostjob/xgboostjob_webhook.go
Auto-merging pkg/controller/jobs/kubeflow/jobs/xgboostjob/xgboostjob_controller.go
Removing pkg/controller/jobs/kubeflow/jobs/tfjob/tfjob_webhook_test.go
Removing pkg/controller/jobs/kubeflow/jobs/tfjob/tfjob_webhook.go
Auto-merging pkg/controller/jobs/kubeflow/jobs/tfjob/tfjob_controller.go
Removing pkg/controller/jobs/kubeflow/jobs/pytorchjob/pytorchjob_webhook_test.go
Removing pkg/controller/jobs/kubeflow/jobs/pytorchjob/pytorchjob_webhook.go
Auto-merging pkg/controller/jobs/kubeflow/jobs/pytorchjob/pytorchjob_controller.go
Removing pkg/controller/jobs/kubeflow/jobs/paddlejob/paddlejob_webhook_test.go
Removing pkg/controller/jobs/kubeflow/jobs/paddlejob/paddlejob_webhook.go
Auto-merging pkg/controller/jobs/kubeflow/jobs/paddlejob/paddlejob_controller.go
Removing pkg/controller/jobs/kubeflow/jobs/mxjob/mxjob_webhook_test.go
Removing pkg/controller/jobs/kubeflow/jobs/mxjob/mxjob_webhook.go
Auto-merging pkg/controller/jobs/kubeflow/jobs/mxjob/mxjob_controller.go
Auto-merging pkg/controller/jobframework/base_webhook_test.go
CONFLICT (content): Merge conflict in pkg/controller/jobframework/base_webhook_test.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Add a BaseWebhook that replaces all kubeflow webhooks

In response to this:

/cherry-pick release-0.8

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