Resolves: https://github.com/orgs/shop/projects/208/views/34?pane=issue&itemId=137773625&issue=shop%7Cissues-api-foundations%7C1069

Background
The basic setup of the BulkOps CLI command was done here. The basic command used BulkOps Query. We are implementing BulkOps Mutation in this PR.

Implementation Details

• We parse the query given to us in the flag to determine if the GraphQL command is a query or a mutation. Then, we do the respective GraphQL API call.

• Bulk operation CLI accept variables via the --variables flag in JSON format. However, the Shopify Admin API requires these variables to be uploaded as a JSONL file rather than passed inline. So, in the stage-file.ts file, we needed to:

    1. Create a staged upload target via `stagedUploadsCreate` mutation.
    2. Extract the variables from JSON format and put it in a JSONL file. 
    3. Upload the JSONL file to the temporary GCS URL from staged upload.
    4. Pass the staged upload key to `bulkOperationRunMutation`.
  

• There will be a future PR that deals with creating a --variable-file flag that links to a file containing the values for bulk mutations, in JSONL format.

• Used GraphQL code generation configuration for the bulkOperationRunMutation API and stagedUpload API. Ran pnpm graphql-codegen to generate TypeScript types from GraphQL queries/mutations

Architecture improvements:

• Authentication happens once at executeBulkOperation level via ensureAuthenticatedAdmin, then the session is passed down to runBulkOperationQuery and runBulkOperationMutation
• Command flags are spread directly into executeBulkOperation (...flags) instead of parsing individual properties.

Testing

• Setup
  1. Follow the instructions here to setup a test app
  2. Go here and create a store (if not already have one).
• Testing Mutation
  To test the mutation part of the CLI, run:

pnpm shopify app execute --path=<path to test app> --query='mutation productUpdate($input: ProductInput!) { productUpdate(input: $input) { product { id tags } userErrors { field message } } }' --variables='[{"input": {"id": "gid://shopify/Product/<product id>", "tags": ["bulk-test"]}}]'