Fix: Auth Wizard not properly handling enter key actions

[dinhtungdu]

Description of the Change

This PR fixes/implements the following behavior:

• Trigger click event of Authorize Connection button when press enter key on External connection site URL field.
• When editing an external connection, the submit action is updating the action, not starting the auth process.
• For .com apps, the enter key needs to submit the client ID/secret and start that auth process.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

[helen]

Can we use this PR to address all the enter key usage on the connection setup/edit screen? I notice the following:

• When editing an external connection, the submit action is updating the action, not starting the auth process.
• For .com apps, the enter key needs to submit the client ID/secret and start that auth process.

[helen]

Also noting that the corresponding issue this should fix is #584

[dinhtungdu]

@helen This PR is ready to review again.

[helen]

Works as expected!