avoid client config generation race condition

[rtpascual]

Problem

There seems to be a race condition between client config generation and asserting post deployment, sometimes we see this error:

Compared to a successful run:

Issue number, if available:

Changes

Use existing waitForConfigUpdateAfterDeployment action to wait for amplify_outputs.json to be generated before interrupting sandbox and asserting post deployment.

Also following #2160, removed the rejectCleanupSandbox action since the prompt no longer exists.

Corresponding docs PR, if applicable:

Validation

E2E tests and canary test run https://github.com/aws-amplify/amplify-backend/actions/runs/11635102140.

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.

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Latest commit: 1ec2c61

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