Auto register icons

[elenagarrone]

Description

This PR contains breaking changes:

• updates both Brand and UI icons code to automatically register the icons
• updates svg-to-ts configs to generate a separate file for each svg
• updates the webpack config to move the new files into the dist
• updates the new lib folders to .gitignore
• updates the scripts in the package.json
• updates the brand icon component Inputs to make sure the halfToneColour and outlineColour are always set
• removes the svg path from the .lintstagedrc.js as how it worked was not ideal and the icons are now generated when npm run build runs
• updates all the stories and test app to not register icons anymore
• removes registerIcon and registerBrandIcon from the registries
• updated getIcon and getBrandIcon to be renamed to get. They both return a Promise.
• updated pull_request.yml to run the Build and Test job together. Build is needed before Test because it has to generate the icons sets.

Note
All the changes have been tested within our apps and they work.

Additional test on deployed environment:

• Accordion with icons loads correctly
  
• The icons are lazy loaded correctly
  

Checklist:

• The commit messages follow the convention for this project
• I have provided an adequate amount of test coverage
• I have added the functionality to the test app
• I have provided a story in storybook to document the changes
• I have added the documentation
• I have added any new public feature modules to public-api.ts

[github-actions]

🎉 This PR is included in version 13.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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