[CI-4335] Export all utils functions

[evanyan13]

• Moved src/utils.tsx to src/utils folder and split it into two separate files
  • utilFunctions
  • pageHelpers
• Created src/utils/index.ts to export all functions within folder
• Exported entire utils folder in src/index.ts

export * as utils from './utils';

[Mudaafi]

LGTM!

This change should be backwards compatible as the functions that were previously available in utils from import {utils} from plp-library will continue to be available alongside these other functions. The only issue would be if they directly referenced certain paths in the utils folder to gain access to MakeOptional, they would now get a reference error after updating. I think explicitly navigating down the library tree when importing the library isn't something we need to ensure backwards support for, so I believe we're good 👍