feat: Move comprehensive coverage check workflow before approved (#9482)

* Add comprehensive coverage check workflow

Created a dedicated workflow that runs code coverage before PR approval:

🚀 Coverage Runs Early:
- Triggers: Push to branches + PR events (opened, sync, ready_for_review)
- Smart filtering: Only runs when backend code changes
- Fast feedback: Unit tests only for quick coverage results

📊 Comprehensive Reporting:
- CodeCov integration with proper flags and naming
- PR comments with coverage status and links
- Workflow summary with coverage percentage
- Coverage artifacts (XML + HTML) saved for review

⚡ Intelligent Execution:
- Path filtering: src/backend/**, pyproject.toml, uv.lock
- Branch filtering: main, develop, feature/**, fix/**, hotfix/**
- Draft protection: Skips draft PRs
- Dynamic naming: Different names for push vs PR contexts

🎯 Benefits:
- Developers get immediate coverage feedback on push
- Reviewers see coverage context during PR review
- Coverage issues caught before approval, not after
- Continuous monitoring of coverage trends across branches

This replaces the previous "coverage after approval" approach with
"coverage before approval" - exactly what was requested!

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Remove all restrictions from coverage workflow

- Coverage now runs on ANY push to ANY branch
- Coverage runs on ANY PR with ANY changes
- No path filtering - runs regardless of what files changed
- No branch filtering - runs on all branches
- Ensures coverage runs on every PR as requested

* move test to be run when we submit pr

* Configure CI to run tests before PR approval

- Remove 'lgtm' label requirement from CI trigger
- Run tests immediately on PR opened/synchronized events
- Add ci.yml to path filters to trigger tests when workflow changes
- Coverage and tests now run before approval for early feedback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* add labeled

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Co-authored-by: Claude <noreply@anthropic.com>