BED-9680: optimize environment collection

[jaredcatkinson]

Summary

• capture GitHub-reported branch and environment totals from the repository GraphQL query
• skip per-repository environment REST collection when GraphQL reports zero environments
• expose branch_count and environment_count on GH_Repository for collection completeness validation

Testing

• uv run pytest tests/test_repository_rulesets.py tests/test_environment_resources.py
• uv run pytest

Notes

• This branch is stacked on the currently open GitHub Actions modeling work through BED-9678.

[coderabbitai]

Important

• 🔍 Trigger review

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 392a9ac4-596c-4510-af01-c4e98addcdca

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_{Comment @coderabbitai help to get the list of available commands.}