GetReferenceManifest and GetBlobContent will fail early on cache failures in Oras Store

[binbin-li]

What happened in your environment?

Both methods relies on cache to improve performance, however, the current implementation will fail early if cache operation fails which is not expected.

What did you expect to happen?

No response

What version of Kubernetes are you running?

No response

What version of Ratify are you running?

No response

Anything else you would like to add?

No response

Are you willing to submit PRs to contribute to this bug fix?

• Yes, I am willing to implement it.