[master] Chore/1102 form data security fix

[MarkFarmiloe]

This is a:

• ✨ New feature - new behaviour has been implemented
• 🐛 Bug fix - existing behaviour has been made to behave
• ♻️ Refactor - the behaviour has not changed, just the implementation
• ✅ Test backfill - tests for existing behaviour were added but the behaviour itself hasn't changed
• ⚙️ Chore - maintenance task, behaviour and implementation haven't changed

Description

form-data needs to be upgraded to ^4.0.4.
This cannot be done (safely) with react-scripts, so need to move to Vite, which is already in ADR0002 and Migrate client app from CRA to Vite
#850.

• Purpose
  Enhance security and future maintenance.

• How to check -
  Run and test the form.

Links

Fix 'form-data uses unsafe random function' security vulnerability
#1102

Author checklist

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• I have added tests, or new tests were not required
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