test: remove sigint handling for gen2 cli in e2e tests

[atierian]

Problem

Sending SIGINT (ctrl + c) to the sandbox process no longer prompts the user.

Would you like to delete all the resources in your sandbox environment (This cannot be undone)?
> 

Instead it now prints guidance.

Stopping the sandbox process. To delete the sandbox, run npx ampx sandbox delete

Some of our E2E tests expect that prompt and throw if it's not.

Description of changes

Don't expect the prompt.

Codegen Paramaters Changed or Added

N/A

Issue #, if available

Related Backend PR:

• update ctrl+c behavior to always print guidance and not prompt amplify-backend#2160

Description of how you validated changes

• E2E test run

Checklist

• PR description included
• yarn test passes
• E2E test run linked
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• Breaking changes to existing customers are released behind a feature flag or major version update
• Changes are tested using sample applications for all relevant platforms (iOS/android/flutter/Javascript) that use the feature added/modified
• Changes are tested on windows. Some Node functions (such as path) behave differently on windows.
• Changes adhere to the GraphQL Spec and supports the GraphQL types type, input, enum, interface, union and scalar types.

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