Report root stack deletion failures during create

[GrahamCampbell]

Summary

• Detect root stack DELETE_IN_PROGRESS during non-delete stack monitoring as a deployment failure.
• Preserve the CloudFormation failure reason instead of later failing with a missing-stack error.

Refs serverless/serverless#13181

[Copilot]

Pull request overview

Detects and reports root stack DELETE_IN_PROGRESS during non-delete stack monitoring as a deployment failure, preserving the CloudFormation failure reason instead of later failing with a missing-stack error.

Changes:

• Treats root stack DELETE_IN_PROGRESS as an error signal during create/update monitoring and captures the CF failure reason early.
• Adds unit tests covering root DELETE_IN_PROGRESS behavior (non-verbose + verbose-with-cleanup) and ensuring nested stack deletes during update do not trigger a root-failure.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
lib/plugins/aws/lib/monitor-stack.js	Flags root stack DELETE_IN_PROGRESS as a failure during non-delete monitoring to preserve the underlying CF reason.
test/unit/lib/plugins/aws/lib/monitor-stack.test.js	Adds regression tests for root delete-in-progress failure reporting and a nested-stack non-regression case.

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