Add changelog entries for the pre-release fixes

[romaricpascal]

Wondered if #4394 could be a new feature, but in the end, it'll likely get removed in the final changelog for v5 (as it's a change to a new feature) so prefered keeping things simple and put both as fixes.

[github-actions]

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File sizes

File	Size
dist/govuk-frontend-5.0.0-beta.0.min.css	114 KiB
dist/govuk-frontend-5.0.0-beta.0.min.js	37.85 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	77.08 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	72.37 KiB
packages/govuk-frontend/dist/govuk/all.mjs	3.8 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	359 B
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	113.99 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	37.92 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.3 KiB

Modules

File	Size
all.mjs	68.7 KiB
components/accordion/accordion.mjs	21.35 KiB
components/button/button.mjs	4.48 KiB
components/character-count/character-count.mjs	20.79 KiB
components/checkboxes/checkboxes.mjs	5.61 KiB
components/error-summary/error-summary.mjs	5.79 KiB
components/exit-this-page/exit-this-page.mjs	15.79 KiB
components/header/header.mjs	3.68 KiB
components/notification-banner/notification-banner.mjs	4.32 KiB
components/radios/radios.mjs	4.6 KiB
components/skip-link/skip-link.mjs	3.6 KiB
components/tabs/tabs.mjs	9.37 KiB

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