Name subnets after the AZ they are deployed in.

[jkodroff]

Fixes #913

Note that this change, as implemented, will cause a replace for existing resources as the name of the resource is currently tied to the Name tag. Happy to separate the two based on PR feedback, or we can include a release note indicating how to alias to prevent the replace.

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[guineveresaenger]

/run-acceptance-tests

[github-actions]

Please view the PR build - https://github.com/pulumi/pulumi-awsx/actions/runs/3138781987

[jkodroff]

@lukehoban Do you have any thoughts on how we should communicate this change to users: Are migration (alias) instructions sufficient?

[github-actions]

PR is now waiting for a maintainer to run the acceptance tests. This PR will only perform build and linting.
Note for the maintainer: To run the acceptance tests, please comment /run-acceptance-tests on the PR

[jkodroff]

@danielrbradley It's been dormant for a while, but I picked this back up and added the aliases. Unit tests look like they pass and I just need to run it against a test Pulumi program made before this change to ensure no resources get re-created.

[github-actions]

PR is now waiting for a maintainer to run the acceptance tests. This PR will only perform build and linting.
Note for the maintainer: To run the acceptance tests, please comment /run-acceptance-tests on the PR

[danielrbradley]

This looks great with the aliases added in! Let me know once you've confirmed the upgrade path works without recreation and I'll approve.