Prefer amplify errors in generators

[sobolk]

Changes

This PR revises expectations about errors for X-generator packages to prefer Amplify Errors.

Reasons:

1. We already use Amplify Errors in them. Changing that would be a break.
2. Translating errors in CLI would leak implementation details. This is unwanted.
3. In order to surface necessary information each of them would need to use error system similar to Amplify Errors.
4. Amplify Errors are part if platform-types. I.e. usable not only in "cli-ish" packages.

Out of scope

I fixed only one violation which was simple and left rest for the future. The priority is to establish these rules.

Validation

PR checks.

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]

🦋 Changeset detected

Latest commit: 8414a85

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

This PR includes changesets to release 3 packages

Name	Type
@aws-amplify/schema-generator	Patch
@aws-amplify/model-generator	Patch
@aws-amplify/form-generator	Patch

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