fix(kubernetes_platform): Add optional field to SecretAsVolume and ConfigMapAsVolume. Fixes #10548

[revit13]

Description of your changes:
Part of #10400 and #10548

This PR adds missing optional field to SecretAsVolume and ConfigMapAsVolume to avoid a failure when the secret or config map used as volume source are missing.

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[google-oss-prow]

Hi @revit13. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[Tomcli]

/lgtm
/ok-to-test

[rimolive]

/test kfp-kubernetes-execution-tests

[rimolive]

Last attempt

/test kfp-kubernetes-execution-tests

[google-oss-prow]

@revit13: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kfp-kubernetes-execution-tests	aaa5070	link	false	/test kfp-kubernetes-execution-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[Tomcli]

@rimolive You don't need to trigger the test if it's not required. That also could help lower the workload on the e2e pipelines.

[Tomcli]

/assign @chensun

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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• kubernetes_platform/OWNERS [chensun]

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