feat(storage): add keepOnDelete to defineStorage()

[adrianjoshua-strutt]

Adds an optional keepOnDelete prop to defineStorage(). When set to false, the construct sets autoDeleteObjects to false automatically. Sandbox deployments always use DESTROY.

import { defineStorage } from '@aws-amplify/backend';

export const storage = defineStorage({
  name: 'amplifyTeamDrive',
  keepOnDelete: true,
});

Issue number, if available: #3147

Corresponding docs PR, if applicable: aws-amplify/docs#8548

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a docs update, I have linked to that docs PR above.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

🦋 Changeset detected

Latest commit: f7ee43c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@aws-amplify/backend-storage	Minor
@aws-amplify/backend	Minor

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