fix(ci): restore protobuf and helm build checks

[drew]

Summary

Restore failing main build checks by making protobuf codegen find well-known proto includes after removing protobuf-src, adding matching protobuf packages to macOS Docker and RPM build environments, and disabling Helm v4 plugin verification for the helm-unittest plugin install in the CI image.

Related Issue

Related to #1387

Changes

• Add explicit well-known protobuf include detection to openshell-core build codegen.
• Install protobuf development headers in macOS/Python Docker build images.
• Add protobuf compiler/devel dependencies to RPM workflow and spec.
• Pass --verify=false for the Helm unittest plugin install in the CI image.

Testing

• cargo fmt --check
• RUSTC_WRAPPER= cargo check -p openshell-core
• RUSTC_WRAPPER= cargo clippy -p openshell-core --all-targets -- -D warnings
• mise x -- helm plugin install --help | rg -n "verify"
• git diff --check
• mise run pre-commit

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

[copy-pr-bot]

Auto-sync is disabled for draft pull requests in this repository. Workflows must be run manually.

Contributors can view more details about this message here.