fix: infer default namespace unless provided by provider config

[rawkode]

Proposed changes

Use the discovered kubeconfig namespace when one isn't provided by the Provider configuration instead of default.

Related issues (optional)

Fix #971

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[rawkode]

@viveklak OK, I spent some time this morning going through this code properly and I understand the problem now. I've updated the PR.

I have no idea how to write a unit test for the Configure method or if that's even possible, so I've done manual testing locally with the built provider binary.

Setup:

pulumi new kubernetes-typescript

Test 1:

• I added namespace: test-me to the context for my local Kubernetes cluster
• pulumi up
• Resource was created in test-me namespace

Test 2:

• Continue from above
• pulumi config set kubernetes:namespace default
• pulumi up
• Resource is replaced and deployed to default namespace

I believe this is the behaviour that we need to resolve #971

cc @lblackstone

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[lblackstone]

/run-acceptance-tests

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Please view the PR build - https://github.com/pulumi/pulumi-kubernetes/actions/runs/1790575272