Fix namespace override in kubeconfig initialization

[jrhouston]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

This PR fixes logic for setting the namespace when the Kubernetes client is initialized.

Related #1646

Acceptance tests

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Release Note

Release note for CHANGELOG:

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References

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[loomsen]

Thank you. Imo this is super critical and needs to be merged asap, as the current status breaks things.

edit
Also, the way back is not possible once the update to version >=3.0.0 was done, so this is really really critical for us.