[SPIKE] Enable Terser ES module aware minification

[colinrotherham]

We forgot to enable Terser module: true now we use ES modules for govuk-frontend.min.js

Adding this config change to see what the diff looks like

Surprise: Nothing

[github-actions]

📋 Stats

File sizes

File	Size
dist/govuk-frontend-development.min.css	113.72 KiB
dist/govuk-frontend-development.min.js	38.28 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	77.78 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	73.09 KiB
packages/govuk-frontend/dist/govuk/all.mjs	3.86 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	359 B
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	113.7 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	38.27 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.38 KiB

Modules

File	Size
all.mjs	69.41 KiB
components/accordion/accordion.mjs	21.67 KiB
components/button/button.mjs	4.7 KiB
components/character-count/character-count.mjs	21.24 KiB
components/checkboxes/checkboxes.mjs	5.83 KiB
components/error-summary/error-summary.mjs	6.09 KiB
components/exit-this-page/exit-this-page.mjs	16.08 KiB
components/header/header.mjs	3.9 KiB
components/notification-banner/notification-banner.mjs	4.54 KiB
components/radios/radios.mjs	4.83 KiB
components/skip-link/skip-link.mjs	3.81 KiB
components/tabs/tabs.mjs	9.66 KiB

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JavaScript changes to npm package

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Stylesheets changes to npm package

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Other changes to npm package

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