Continuing the work from:

• Fix our GraphQL usage (use native variables) #5848
• Meta: Use variables in GraphQL #6674

To do, extracted from the last PR:

• TypeScript integration that will help us use the results in the file
• GraphQL autocomplete in the IDE thanks to the schema
• Typed variables that make TypeScript complain if one is missing or unused
• Prettier/formatter for GQL support (we have a .prettierignore file)

Extensions suggested:

• https://chrome.google.com/webstore/detail/graphql-network-inspector/ndlbedplllcgconngcnfmkadhokfaaln
• https://marketplace.visualstudio.com/items?itemName=GraphQL.vscode-graphql-syntax