Add edge branch support to community targets

[igorpecovnik]

Summary

• Add edge branch categorization to generate_community_yaml() function
• Edge branch boards are now included in generated YAML for community targets
• Edge boards are filtered to exclude those that also have a current branch (prefer current over edge)

Test plan

• Boards with only edge kernel (e.g., radxa-cubie-a5e) are now included in community targets
• Boards with both current and edge kernels only use current branch (edge is excluded)

[coderabbitai]

Walkthrough

The change modifies the script to introduce edge-specific board filtering and YAML generation. It computes a set of boards already in the current branch and filters edge boards to exclude those already covered. New edge-specific sections are added to the community YAML (edge_fast-hdmi, edge_slow-hdmi, edge_headless, edge_riscv64, edge_loongarch) with sorted board entries. Target definitions are extended to reference these new sections, and conditional logic is updated to include edge variants in various community targets.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Suggested labels

Needs review

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding edge branch support to community targets, which aligns with the changeset's core functionality.
Description check	✅ Passed	The description clearly explains the changes including edge branch categorization, YAML generation, and filtering logic, with specific test cases demonstrating the implementation.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/add-edge-branch-to-community-targets

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