Fix failure of pulumi preview with AWS_PROFILE

[t0yv0]

When I do pulumi new https://github.com/pulumi/apps/eks and then AWS_PROFILE=devsandbox pulumi preview in the generated app, it fails with:

    error: Running program '/Users/anton/apps/eks' failed with an unhandled exception:
    Error: providerCredentialOpts and AWS_PROFILE must be set together
        at new Cluster (/Users/anton/apps/eks/node_modules/@pulumi/cluster.ts:1385:19)
        at Object.<anonymous> (/Users/anton/apps/eks/index.ts:21:17)
        at Module._compile (internal/modules/cjs/loader.js:1137:30)
        at Module.m._compile (/Users/anton/apps/eks/node_modules/ts-node/src/index.ts:439:23)
        at Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
        at Object.require.extensions.<computed> [as .ts] (/Users/anton/apps/eks/node_modules/ts-node/src/index.ts:442:12)
        at Module.load (internal/modules/cjs/loader.js:985:32)
        at Function.Module._load (internal/modules/cjs/loader.js:878:14)
        at Module.require (internal/modules/cjs/loader.js:1025:19)
        at require (internal/modules/cjs/helpers.js:72:18)

Adding empty providerCredentialOpts fixes it for me. But this sounds fishy.

I have created devsandbox profile via aws configure sso.

IN addition to that, the dashboard arg is triggering a deprecation warning.

pulumi version
v2.25.0

pulumi plugin ls
NAME        KIND      VERSION  SIZE    INSTALLED       LAST USED
aws         resource  3.38.1   253 MB  29 minutes ago  29 minutes ago
docker      resource  2.10.0   39 MB   29 minutes ago  29 minutes ago
kubernetes  resource  2.9.1    71 MB   29 minutes ago  12 minutes ago

aws --version
aws-cli/2.1.29 Python/3.8.8 Darwin/19.6.0 source/x86_64 prompt/off

Let me test if the change breaks other auth methods.

[t0yv0]

The env var authentication method works before and after the change.

export AWS_ACCESS_KEY_ID=..
export AWS_SECRET_ACCESS_KEY=..
export AWS_SESSION_TOKEN=..

I think the AWS_PROFILE authentication method should work without the boilerplate addition, so let me look at the code that originates the issue.