refactor: rename CI Insights to Mergify Test Insights everywhere

[sileht]

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

[mergify]

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[Copilot]

Pull request overview

This PR updates user-facing messaging to reflect the “Mergify Test Insights” naming in the pytest-mergify plugin’s quarantine and terminal summary output.

Changes:

• Rename “CI Insights Quarantine” wording to “Mergify Test Insights Quarantine” in initialization errors and terminal summary messages.
• Rename “CI Insights” references to “Mergify Test Insights” in quarantine-related comments and xfail reasons.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
pytest_mergify/quarantine.py	Updates quarantine setup error text, subscription comment, and xfail reason to “Mergify Test Insights”.
pytest_mergify/__init__.py	Updates terminal summary headings and quarantine-related log lines to “Mergify Test Insights”.

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