Support truthy values for boolean environment variables

[lblackstone]

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Issue details

Currently, the provider supports a number of boolean-typed environment variables. The provider logic only accepts "true" to enable the option, but this is probably overly restrictive.

Here is one example, but this pattern is widespread in the provider:
https://github.com/pulumi/pulumi-kubernetes/blob/v3.23.0/provider/pkg/provider/provider.go#L404-L415

Affected area/feature