Resolve "Update grape to v1.0.2 when it is released"

What

Updates grape and removes a declared(params) workaround

Why

See https://github.com/ruby-grape/grape/pull/1710

Acceptance criteria

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #40843 (closed)