Add docs for Pulumi ESC provider for Kubernetes' External Secrets Operator (ESO).

[thoward]

Documentation of the provider exists here: https://external-secrets.io/latest/provider/pulumi/

But we have nothing on our site about this. Extend docs at https://www.pulumi.com/docs/esc/integrations/kubernetes/ to include, at minimum, a mention of this Provider and what features it supports, with a link to the ESO docs.

Stretch would be to write a tutorial about how to use it.

[thoward]

Related issue: https://github.com/pulumi/docs/issues/12555

[dirien]

Hey @thoward,

can you have a look for PR: https://github.com/pulumi/docs/pull/13771 and if it's okay.

[pulumi-bot]

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