A regression was introduced when we added support for non-Node.js Pulumi programs to run Policy Packs. With that change, we now pass the Policy Pack's full path as the plugin's pwd (so that it would load the `@pulumi/pulumi/cmd/run-policy-pack` Node module from the Policy Pack's node_modules rather than the program's node_modules), but we also pass the path to the policy pack as well. If the path is a full rooted path, this would work fine, and that's what our tests do. However, if a relative path is specified, then it will be looking to load the Policy Pack relative to the pwd, which doesn't produce a correct path leading to failures trying to load the Policy Pack.
Since the pwd is the policy pack path, we can simply pass the path as `"."` to the analyzer plugin, and it will load the policy pack in its pwd.
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