Fix default behaviour of enter press leading to form submission in core components.

[muskgupta]

Description

Pressing enter on core components redirects to thankyou page which is not the correct behaviour. This fix prevents the default behaviour of enter press on form level.

Related Issue

https://jira.corp.adobe.com/browse/FORMS-15630

Motivation and Context

How Has This Been Tested?

Tested on localhost deployment and test cases tested using cypress.

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes and the overall coverage did not decrease.
• [x] All unit tests pass on CircleCi.
• [x] I ran all tests locally and they pass.