[NO_TICKET] Update CMSDS to v2.5.0

[bernardwang]

Summary

• Update button styles to maintain existing styles
  • The CMSDS button styles had to be changed to match focus styles with hover styles. However, in the MDS focus styles are entirely independent from hover styles. Changes to button.overrides.scss was necessary to preserve the existing styles.
• Update React example files to use @design-system alias
  The CMSDS scripts have been updated to use the @design-system alias over @src. This means imports using @design-system will resolve from dist/esnext/index.js, meaning you can use named imports without specifying the path. This also means example react files don't need to import from the core CMSDS package.

How to test

• Ensure all MDS react examples are working as expected
• Ensure button styles look good
• Run this branch through coverage-tools and ensure no regressions

[nichia]

I'm getting the following warning message during yarn build:
[15:14:49] 🖊 Overriding components.button.react page with docs/src/pages/components/Button/Button.docs.scss [15:15:36] WARNING in ./docs/src/pages/components/HHSLogo/HHSlogo.example.tsx 4:36-43 "export 'HHSlogo' was not found in '@design-system' [15:15:36] WARNING in ./docs/src/pages/components/CloseSymbol/CloseSymbol.example.tsx 4:36-47 "export 'CloseSymbol' was not found in '@design-system' [15:15:36] WARNING in ./docs/src/pages/components/HamburgerSymbol/HamburgerSymbol.example.tsx 4:36-51 "export 'HamburgerSymbol' was not found in '@design-system' [15:15:44] 📝 170 Example pages added to ./docs

[nichia]

I think it's related to the warning message mentioned above where these components are not getting exported - these react components are not working on the Mgov docs site - Close Icon, HHSlogo, Hamburger Icon

[nichia]

Aside from the above comment, coverage tools frontend seems to work as expected.

[nichia]

@babsmiles - This PR updates CMSDS to v2.5.0 which includes changes to buttons styling to keep existing style. Can you review to ensure styling is still maintained. Thanks

[line47]

LGTM! 🚀