feat: Add updateGlobalContexts support to updateProjectData endpoint

[field123]

Summary

Add support for updating global context props via the updateProjectData API endpoint. This enables commerce-manager to configure global
context providers (like the Elastic Path Provider) when cloning templates.

Changes

• Add UpdateGlobalContextReq type to ApiSchema.ts
• Add updateGlobalContexts field to UpdateProjectReq
• Extract global context update logic to global-context-utils.ts module
• Integrate with updateProjectData endpoint in projects.ts

Testing

• Unit tests (global-context-utils.spec.ts): 8 tests covering pure function logic

  • Empty updates
  • Successful prop updates
  • Warning when global context not found
  • Warning when prop not found
  • Multiple updates with warnings
  • No variant settings edge case
  • Null and boolean prop values

• Integration tests (projects.spec.ts): 6 tests covering API endpoint

  • Warning when global context not found
  • Empty updates succeed
  • Multiple non-existent contexts
  • Warning when prop not found on global context
  • Successfully update global context props
  • Persist global context updates

Usage

await updateProjectData({                                                                                                                     
  client: plasmic.client,                                                                                                                     
  path: { projectId },                                                                                                                        
  body: {                                                                                                                                     
    updateGlobalContexts: [{                                                                                                                  
      name: "plasmic-commerce-elastic-path-provider",                                                                                         
      props: {                                                                                                                                
        clientId: "my-client-id",                                                                                                             
        host: "https://api.elasticpath.com"                                                                                                   
      }                                                                                                                                       
    }]                                                                                                                                        
  }                                                                                                                                           
})                                                                                                                                            

Test Plan

• Unit tests pass: yarn test global-context-utils.spec
• Integration tests pass: yarn test projects.spec