feat: add scopes to CI Job summary

[sileht]

This adds some information on the job page on the matching scopes.

This is very useful for reporting what the action does and for debugging.

[Copilot]

Pull Request Overview

This PR adds a GitHub Actions job summary feature that displays scope matching results in a formatted markdown table. The summary includes all scopes and indicates which ones matched the changes using checkmark and cross emojis.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
mergify_cli/ci/scopes/cli.py	Implements maybe_write_github_step_summary() function and integrates it into the detect() workflow
mergify_cli/tests/ci/scopes/test_cli.py	Adds test coverage for the new GitHub step summary functionality

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[sileht]

[mergify]

Merge Protections

Your pull request matches the following merge protections and will not be merged until they are valid.

🟢 🤖 Continuous Integration

Wonderful, this rule succeeded.

• all of:
  • check-success=test (macos-15)
  • check-success=test (ubuntu-24.04)
  • check-success=test (windows-2025)

🟢 👀 Review Requirements

Wonderful, this rule succeeded.

• any of:
  • #approved-reviews-by>=2
  • author = dependabot[bot]
  • author = renovate[bot]

🟢 Enforce conventional commit

Wonderful, this rule succeeded.

Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?:

🟢 🔎 Reviews

Wonderful, this rule succeeded.

• #changes-requested-reviews-by = 0
• #review-requested = 0
• #review-threads-unresolved = 0

[mergify]

🧪 CI Insights

Here's what we observed from your CI run for 01450ca.

🟢 All jobs passed!

But CI Insights is watching 👀

Pull request has been modified.

Pull request has been modified.