[NO JIRA][BpkLoadingButton]: Updating TS types and removing propTypes ahead of React 18

[olliecurtis]

As part of the migration to React 18 when running tests we found errors that were being through due to the mix of TS types and and propTypes which are deprecated and discouraged since React 17

console.error
    Warning: BpkLoadingButton: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.
        at className (/Users/olivercurtis/Documents/Backpack/backpack/packages/bpk-component-loading-button/src/BpkLoadingButton.tsx:39:11)

Remember to include the following changes:

• [x] Ensure the PR title includes the name of the component you are changing so it's clear in the release notes for consumers of the changes in the version e.g [KOA-123][BpkButton] Updating the colour
• [ ] README.md (If you have created a new component)
• [ ] Component README.md
• [x] Tests
• [ ] Accessibility tests
  • The following checks were performed:
    • [ ] Ability to navigate using a keyboard only
    • [ ] Zoom functionality (Deque University explanation):
      • [ ] The page SHOULD be functional AND readable when only the text is magnified to 200% of its initial size
      • [ ] Pages must reflow as zoom increases up to 400% so that content continues to be presented in only one column i.e. Content MUST NOT require scrolling in two directions (both vertically and horizontally)
    • [ ] Ability to navigate using a screen reader only
• [ ] Storybook examples created/updated
• [ ] For breaking changes or deprecating components/properties, migration guides added to the description of the PR. If the guide has large changes, consider creating a new Markdown page inside the component's docs folder and link it here

[github-actions[bot]]

Visit https://backpack.github.io/storybook-prs/3588 to see this build running in a browser.

[github-actions[bot]]

	Warnings
:warning:	Package source files (e.g. `packages/package-name/src/Component.tsx`) were updated, but type files weren't. Have you checked that no types have changed?

Browser support

If this is a visual change, make sure you've tested it in multiple browsers.

Generated by :no_entry_sign: dangerJS against f3bf3e05f4863c4091fd449666010742a13ca2fc

[github-actions[bot]]

Visit https://backpack.github.io/storybook-prs/3588 to see this build running in a browser.

[github-actions[bot]]

Visit https://backpack.github.io/storybook-prs/3588 to see this build running in a browser.