fix(ci): add git_only option to release-plz config for unpublished packages

[km-tr]

Summary

When publish=false but git_only is not set, release-plz attempts to check the crates.io registry and fails to detect unreleased changes. This causes the release-pr command to output "the repository is already up-to-date" and skip PR creation.

Setting git_only=true enables git tag-based version detection for packages distributed as binaries via cargo-dist, rather than relying on the cargo registry.

Test plan

• Push changes to main or re-run release-plz workflows
• Verify that release-plz release-pr now detects changes and creates a release PR with version bump
• Verify that subsequent release-plz release creates tags as expected
• Confirm cargo-dist workflow is triggered by the new tags

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[coderabbitai]

Important

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• release-plz.toml is excluded by !**/*.toml

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[Copilot]

Pull request overview

This PR fixes a configuration issue in release-plz that prevented it from detecting unreleased changes. The project distributes binaries via cargo-dist rather than publishing to crates.io, but the git_only option was missing from the configuration. Without this option, release-plz attempts to check the crates.io registry (which always fails when publish=false) instead of using git tags for version detection.

Changes:

• Add git_only = true to release-plz.toml to enable git tag-based version detection

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