Fix Cifar10 drift detection example's InferenceService

[aliok]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

• gs://kfserving-examples/tfserving/cifar10/resnet32 doesn't exist anymore. Changing it with gs://seldon-models/tfserving/cifar10/resnet32.
• Change InferenceService api version to v1beta1. Also change the spec: no default anymore.

Type of changes
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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Feature/Issue validation/testing:

Please describe the tests that you ran to verify your changes and relevent result summary. Provide instructions so it can be reproduced.
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• Test A

• Test B

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Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Checklist:

• Have you added unit/e2e tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

Release note:

[yuzisun]

Thanks @aliok !

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aliok, yuzisun

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