Classify pointing client config generator at metadata-less stack as u…

aws-amplify / amplify-backend

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Apache License 2.0

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…ser error

Problem

Absence of metadata in a stack implies that CLI / config generator was pointed to a stack that was not created by Amplify.

Classify such error as user error.

Added test.

[ ] 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.

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