Add a button role to summary element

[owenatgov]

Potential solution to address #5308

Being tested against other AT now to make sure it doesn't break anything. Results recorded in this testing spreadsheet.

[github-actions]

📋 Stats

File sizes

File	Size
dist/govuk-frontend-development.min.css	118.62 KiB
dist/govuk-frontend-development.min.js	44.47 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	91.6 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	86 KiB
packages/govuk-frontend/dist/govuk/all.mjs	1.11 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	359 B
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	118.6 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	44.46 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.55 KiB
packages/govuk-frontend/dist/govuk/init.mjs	5.04 KiB

Modules

File	Size (bundled)	Size (minified)
all.mjs	83.1 KiB	42.26 KiB
accordion.mjs	23.5 KiB	12.39 KiB
button.mjs	5.98 KiB	2.69 KiB
character-count.mjs	22.4 KiB	9.92 KiB
checkboxes.mjs	5.83 KiB	2.83 KiB
details.mjs	2.9 KiB	1.63 KiB
error-summary.mjs	7.89 KiB	3.46 KiB
exit-this-page.mjs	17.1 KiB	9.26 KiB
header.mjs	4.46 KiB	2.6 KiB
notification-banner.mjs	6.26 KiB	2.62 KiB
password-input.mjs	15.15 KiB	7.25 KiB
radios.mjs	4.83 KiB	2.38 KiB
service-navigation.mjs	4.46 KiB	2.69 KiB
skip-link.mjs	4.39 KiB	2.18 KiB
tabs.mjs	10.05 KiB	6.06 KiB

View stats and visualisations on the review app

---

Action run for afa39c2