Remove project-to-repository linking in update-project safe output

[Copilot]

The update-project safe output was automatically linking resolved projects to the current repository using the linkProjectV2ToRepository GraphQL mutation. This linking behavior is now removed.

Changes

• pkg/workflow/js/update_project.cjs: Removed the linkProjectV2ToRepository mutation call and associated error handling (lines 160-169)
• Step numbering: Updated progress messages from 5 steps to 4 steps (removed "[3/5] Linking project to repository...")
• pkg/workflow/js/update_project.test.cjs: Removed linkResponse mock from all 16 test cases

Behavior

Before:

// Step 3: Attempted to link project to repository
await github.graphql(
  "mutation($projectId: ID!, $repositoryId: ID!) { ... }",
  { projectId, repositoryId }
);

After:

// Step 3: Directly proceeds to processing content
core.info("[3/4] Processing content (issue/PR/draft) if specified...");

Project resolution, item management, and field updates remain unchanged.

Original prompt

In update-project safe output do not attempt to link the resolved project to the current repository.

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