Report workflow postreview fixes

[numbata]

This pull request makes several improvements to the Danger integration by simplifying the Dangerfile logic, updating workflow references for better maintainability, and clarifying the documentation. The most significant changes are grouped below.

Dangerfile and workflow logic improvements:

• Simplified the at_exit hook in the Dangerfile to directly reference the current Dangerfile instance instead of searching through all objects, making the export logic more robust and efficient.
• Updated the error check in .github/workflows/danger-comment.yml to use the hasItems utility for consistency and reliability.

Documentation and workflow reference updates:

• Changed all workflow references in the README.md from ruby-grape/ruby-grape-danger to ruby-grape/danger, reflecting the new reusable workflow location for easier updates and consistency across projects.
• Removed the "Benefits of Reusable Workflows" section from the README.md to streamline and clarify the documentation.

[github-actions]

Danger Report

ℹ️ Messages

• We really appreciate pull requests that demonstrate issues, even without a fix. That said, the next step is to try and fix the failing tests!

[Copilot]

Pull request overview

This pull request improves the Danger integration by updating dependency versions, simplifying the Dangerfile logic, standardizing workflow references, and streamlining documentation. The key changes include updating the danger-changelog dependency to version 0.8, refactoring the at_exit hook to capture the Dangerfile instance directly instead of using ObjectSpace, updating all workflow references to point to ruby-grape/danger instead of ruby-grape/ruby-grape-danger, and removing redundant documentation sections.

Key Changes

• Updated danger-changelog dependency from ~> 0.7 to ~> 0.8
• Refactored Dangerfile's at_exit hook to capture the Dangerfile instance upfront rather than searching through ObjectSpace
• Standardized workflow references from ruby-grape/ruby-grape-danger to ruby-grape/danger throughout README

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
ruby-grape-danger.gemspec	Bumps danger-changelog dependency to version 0.8
README.md	Updates workflow references to use ruby-grape/danger path and removes "Benefits of Reusable Workflows" section
Dangerfile	Simplifies at_exit hook by directly capturing the Dangerfile instance instead of using ObjectSpace iteration
.github/workflows/danger-comment.yml	Updates error checking to use the hasItems utility function for consistency

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[numbata]

I was so close to hitting the merge button. 😃

[dblock]

I was so close to hitting the merge button. 😃

I do code reviews! :)

[numbata]

I'll do release then. 0.3.0