Release v5.8.0

[romaricpascal]

What

Release a new version of GOV.UK Frontend with the latest changes we've built.

Why

So people can use this new version

Who needs to work on this

Technical writers, Developers

Who needs to review this

Technical writers, Developers

Done when

Comms preparation

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1. Draft release notes
2. Draft comms
3. Approve comms
4. Approve release notes

GOV.UK Frontend

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1. Follow our process to release GOV.UK Frontend to npm and GitHub
2. Update internal developer docs to use new configuration guidance #5516
   documentation javascript +2

Design System site

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1. Run dependabot to bump the version of govuk-frontend
2. Update site for GOV.UK Frontend 5.8.0 govuk-design-system#4410
   🚀 release +1
3. Cookie banner extends ConfigurableComponent govuk-design-system#4305
   +0

Frontend docs

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1. Run dependabot to bump the version of govuk-frontend
2. Add section about 'Building configurable components' govuk-frontend-docs#488
   documentation 🚀 release +2

Comms

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1. Send comms on Slack channels
2. Send comms to mailing list

Logistics

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1. Ensure issues published in the release are gathered in a GitHub milestone
2. Verify that decisions are appropriately documented (in code/issues/pull request comments or in separate documents linked from issues/pull requests)
3. Update state of published issues on project board
4. Close published issues when appropriate
5. Open any follow-up issues if necessary

[domoscargin]

Comms drafted: https://docs.google.com/document/d/1zMnUNvyQuC9Zrdloe8L3_GnGGEr0RkSS2uCuwkDNtxA/edit?tab=t.0

[domoscargin]

CHANGELOG/Release notes: https://docs.google.com/document/d/1etCN7y2O2ExEFb3NWtrBK-HOS9ZKXeBu1svQm3bsb3g/edit?tab=t.0