Update ObjectStore HealthCheck to use StatObject

[gmfrasca]

• Provided Credentials may not necessarily have ListBucket permissions, so update the Object Store Health Check to use StatObject instead

The issue resolved by this Pull Request:

Resolves #262

Description of your changes:

Updates DSPA ObjectStore prereq Health Check to use StatObject instead of ListBuckets. We cannot assume that the provided credentials have ListBuckets permissions granted, so updating the verification command to StatObject (which is used as part of GetObject/ReadObject and required for the underlying DataSciencePipelines functionality)

Testing instructions

Attempt to create a DSPA with externalStorage, and use credentials that only have PutObject, GetObject, and DeleteObject permissions. Ensure that the DSPA eventually passes the health check (ObjectStorageAvailable CR condition = true). Additional test cases include using default objectStorage and externally hosted, but non-AWS storage options such as minio, ceph, etc.

Checklist

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dsp-developers]

A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-265

[dsp-developers]

A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-265

[rimolive]

/lgtm

[HumairAK]

With odh-dashboard and bad creds I see:

    - lastTransitionTime: '2023-08-23T16:51:33Z'
      message: Could not connect to Object Store
      observedGeneration: 2
      reason: ObjectStoreAvailable
      status: 'False'
      type: ObjectStoreAvailable

With bad endpoint I see the same thing, logs show:

2023-08-23T17:04:47Z INFO Could not connect to (s3.a321mazonaws.com), Error: Get "https://s3.a321mazonaws.com/rhods-dsp-dev/?location=": dial tcp: lookup s3.a321mazonaws.com on 172.30.0.10:53: no such host {"namespace": "my-ds-project", "dspa_name": "pipelines-definition"}

/lgtm
/approve

[openshift-ci]

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