fix: Pascal case enum names in exports block

[MorFix]

Description of changes

A PR was added removing pascal casing for some enum definitions.
One of the places where pascal casing was actually ADDED is JS models' index.js file that defines enums, then exports them.
However, in the export block, the pascal casing transformation wasn't applied, leading to a potential mismatch between names.

E.g: (enum) MyCTA => MyCta transformation generated a MyCta enum but was trying to export MyCTA

Codegen Paramaters Changed or Added

None

Issue #, if available

None

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• 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.