feat(DTFS2-7531): bump gov design library

[ttbarnes]

Introduction ✏️

This PR updates the govuk-frontend package from 4.8.0 to the latest version, 5.7.1 in all UI microservices:

• GEF UI
• Portal UI
• TFM UI

This is the first PR as part of a series of PRs / changes / improvements we can make with the latest GOV design version.

Resolution ✔️

• Bump govuk-frontend package.
• Update all js-enabled scripts to include a conditional govuk-frontend-supported class.
• Update relevant client side scripts integrity hashes.
• Update all client side scripts to have type="module".
• Update express assets, nunjucks config's and SCSS GOV paths.
• Bump MOJ package.
• Update service-unavailable CSS.
• Fix some minor bugs seemingly caused by the GOV design updates (DTFS2-7641, DTFS2-7639, DTFS2-7640, DTFS2-7642).

Miscellaneous ➕

• Update nunjucks component tests assertions to not check the govuk-button--disabled class, since it has been removed. Instead, check the aria-disabled attribute.
• Improve the Portal's main index.njk readability, indentation.
• Update TFM UI's success banner (from this original PR)
• Update TFM "facility pricing risk" table component to be hard coded instead of using the GOV component.
  • Unfortunately, the existing design cannot be achieved by using the GOV component, we have to hard code it. More details in the DTFS2-7531 jira ticket. Documentation has been added to the nunjucks component.
• Various conditional/validation rule tweaks.
• Add missing unit test for a currency validation test.
• Update/align all "reconciliation" status tags to not be uppercase.