Add tests for Kubernetes client in the agent
MR: Pending <!-- The first line of this issue description must be one of the following: 1. `MR: Pending` 2. `MR: <MR link with trailing +>`, 3. If there are multiple MRs: ``` MRs: - <MR 1 link with trailing +>` - <MR 2 link with trailing +>` - ... ``` 4. `MR: No MR` ...and the first description line of the MR should be `Issue: <Issue link with trailing +>` For more context, see: https://about.gitlab.com/handbook/engineering/development/dev/create/ide/index.html#relationship-of-issues-to-mrs --> <!-- The following sections should be filled out as part of the refinement process before the issue is prioritized. For more context, see: https://about.gitlab.com/handbook/engineering/development/dev/create/ide/#2-pre-iteration-planning-meeting --> ## Description Followup from: https://gitlab.com/gitlab-org/cluster-integration/gitlab-agent/-/merge_requests/1811#note_2147622571 The Kubernetes client interface used in the agent by the workspaces domain has been refactored to be more generic, most of these APIs are thin wrappers around a Kubernetes client call. There do exist some functions that would benefit from unit-test coverage within that package. We should write tests for these to make the client wrapper more robust. ## Acceptance Criteria - [ ] Write appropriate unit tests for methods in the client where sensible and applicable <!-- Replace with other type, e.g. bug or maintenance, if appropriate --> <!-- Replace with other subtype if appropriate --> <!-- By default, all issues start in the unprioritized status. See https://handbook.gitlab.com/handbook/engineering/development/dev/create/remote-development/#-planning-process --> <!-- For simplicity and to avoid triage bot warnings about missing workflow labels, we will default to issues starting at the refinement phase -->
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