chore: remove minimal schema from source

[t0yv0]

Keeping a copy of minimal schema (introduced in https://github.com/pulumi/pulumi-aws/pull/4587) is proving to conflict with Pulumi tooling such as upgrade-provider and is not strictly necessary. With this change the minimal schema itself as well as CI checks to make sure it is up to date are removed. Instead it will be computed on-the-fly by the release job as before:

• GitHub actions invoke this: https://github.com/pulumi/pulumi-aws/blob/916e6f28039407d7dcb1a295c6f9e43613dd6f87/.github/workflows/build_provider.yml#L60

• Make extension ensures that this runs go generate prior to the actual build so that the minimal schema is re-computed: https://github.com/pulumi/pulumi-aws/blob/916e6f28039407d7dcb1a295c6f9e43613dd6f87/.mk/minimal_schema.mk#L9

Fixes:

• https://github.com/pulumi/pulumi-aws/issues/4811
• https://github.com/pulumi/pulumi-aws/issues/4702

[t0yv0]

I need one more tweak, but I think this can work.

[github-actions[bot]]

Does the PR have any schema changes?

Looking good! No breaking changes found. No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.