use kube 1.31.0 for tests

[tesshuflower]

• adds 1.31.0 to test matrix in operator.yml
• updates unit tests to use 1.31.0 by default
• sets up kind env with 1.31.0 by default

Describe what this PR does

Is there anything that requires special attention?

Related issues:

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[tesshuflower]

/cc @JohnStrunk

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnStrunk, tesshuflower

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/backube/volsync/blob/main/OWNERS)~~ [JohnStrunk,tesshuflower] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[JohnStrunk]

/retest