Remove deprecated deleteProjectV2View GraphQL mutation

[Copilot]

The campaign generator was failing with GraphQL errors when attempting to delete the default "View 1" from newly created projects. GitHub deprecated and removed the deleteProjectV2View mutation from their Projects V2 API.

Changes

• Removed deleteProjectView() and deleteDefaultView() functions - These attempted to call the non-existent mutation
• Removed automatic view deletion - No longer attempts to delete default view after creating custom views
• Added API limitation documentation - Explains that users must manually delete the default view if desired

Impact

The default "View 1" will remain in projects alongside any custom views. This is a GitHub API limitation with no programmatic workaround.

// Before: Attempted to delete default view (caused errors)
await deleteDefaultView(projectInfo.projectId);

// After: Documents limitation, no deletion attempted
// Note: GitHub automatically creates a default "View 1" when a project is created.
// We cannot delete this view programmatically as the deleteProjectV2View mutation
// has been deprecated and removed from the GitHub GraphQL API.

Original prompt

Fix campaign generator error to delete view1
Found default view "View 1" (ID: PVTV_lADOBVduCs4BMyV8zgJDdks), deleting...
Deleting view...
Warning: Failed to delete default view: Request failed due to following response errors:

• Field 'deleteProjectV2View' doesn't exist on type 'Mutation'
• Variable $viewId is declared by anonymous mutation but not used
  GraphQL Error during: Deleting default view
  Message: Request failed due to following response errors:
• Field 'deleteProjectV2View' doesn't exist on type 'Mutation'
• Variable $viewId is declared by anonymous mutation but not used
  Errors array (2 error(s)):
  [1] Field 'deleteProjectV2View' doesn't exist on type 'Mutation'
  Path: ["mutation","deleteProjectV2View"]
  Locations: [{"line":2,"column":7}]
  [2] Variable $viewId is declared by anonymous mutation but not used
  Path: ["mutation"]
  Locations: [{"line":1,"column":1}]
  Request: {
  "query": "mutation($viewId: ID!) {\n deleteProjectV2View(input: { viewId: $viewId }) {\n deletedViewId\n }\n }",
  "variables": {
  "viewId": "PVTV_lADOBVduCs4BMyV8zgJDdks"
  }
  }
  ✓ Message 1 (create_project) completed successfully
  === Project Handler Manager Summary ===
  Total messages: 4
  Project-related messages processed: 1
  Successful: 1
  Failed: 0

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