set removal policy for resources to destroy in sandbox deployments

[rtpascual]

Problem

For sandbox, some resources are still retained even after running ampx sandbox delete.

Issue number, if available:

Changes

Set RemovalPolicy on all sandbox resources to DESTROY to guarantee all resources are destroyed when deleting a sandbox.

Corresponding docs PR, if applicable:

Validation

Unit tests. Local project with a stateful resource (OpenSearch) and ensure all resources are deleted after running ampx sandbox delete.

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 change to the Project Architecture README, I have included that update in this PR.
• [ ] If this PR requires a docs update, I have linked to that docs PR above.
• [ ] If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 120704dc2818d59926d73b1159826dab1aa9a53a

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

This PR includes changesets to release 1 package

| Name | Type | | -------------------- | ----- | | @aws-amplify/backend | Patch |

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