chore: update nx

[PhilKsr]

DESCRIPTION

• Upgrade nx to 19 with adjustments for breaking change.
• Upgrade nx/eslint-plugin (no breaking changes)
• fix peer dependency ejs

TO-DO

• [x] ~implement and update tests~
• [x] ~update docs~
• [x] ~pull main & resolve merge conflicts~
• [x] ~check Vercel deployment~

CLOSES

closes https://github.com/Frachtwerk/essencium-frontend/security/dependabot/42

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