Replace Ceph samples with latest resources

[tom24d]

Fixes #868

Proposed Changes

• 🗑️ No more use ContainerSource/v1alpha1.
• 🧽 Update samples with the latest resources.

Release Note

Ceph source is now available with Deployment + SinkBinding.

Related: #1255

/cc @slinkydeveloper
cc @yuvalif

[knative-prow-robot]

Hi @tom24d. Thanks for your PR.

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[slinkydeveloper]

/lgtm
/approve

[knative-prow-robot]

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