Draft feature docs: AWS cloud account disconnect flow

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Summary

Documents the new dashboard-driven flow for disconnecting an AWS cloud account from Porter, which now runs synchronously and tears down Porter-managed IAM resources before prompting you to delete the customer-owned porter-access-manager role.

Changes

• Rewrote the AWS Revoking Access section in cloud-accounts/connecting-a-cloud-account.mdx to cover the new flow:
  • Dependent-resource check (clusters, object storage, environment groups) that blocks the Delete button.
  • Dashboard Danger zone → type-to-confirm → Disconnect action.
  • Synchronous teardown of Porter-managed IAM roles and policies, with note that retries are safe.
  • Manual step for deleting the customer-owned porter-access-manager role (with link to the AWS IAM role-deletion guide).

Context

Triggered by porter-dev/code#6576, which made AWS cloud account deletion synchronous and shipped the new Cloud accounts → Danger zone → Delete UI, including the dependents check, name-confirmation dialog, and the post-disconnect reminder to remove the porter-access-manager IAM role.

Requested reviewer: @d-g-town (author of the source PR).

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