fix: make a json dict for the GitHub output

[sileht]

GitHub supports dynamic outputs only if the action use "using: node".
This does not work for "using: composite" or "docker" action.

https://github.com/orgs/community/discussions/10529

The workaround is to dump the json into the output.

Then the GitHub workflow will be able to use fromJSON to read it:

if: fromJSON(steps.action.outputs.scopes).everything

[mergify]

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[mergify]

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[Copilot]

Pull Request Overview

Consolidate GitHub Actions outputs into a single JSON-encoded value to simplify consumption in workflows.

• Aggregate scope results into one output key named "scopes" with a JSON dictionary.
• Update tests to assert the new JSON output format.
• Introduce a constant for the output name and import json.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
mergify_cli/ci/scopes/cli.py	Switch from per-scope lines to a single JSON payload under the "scopes" output; add constant and json import.
mergify_cli/tests/ci/scopes/test_cli.py	Adjust test to assert the new "scopes={...}" single-line JSON output.

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