Add more eval examples + filtering examples by language + fix git concurrent usage (#28719)

Release Notes:

- N/A

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Co-authored-by: michael <michael@zed.dev>
Co-authored-by: agus <agus@zed.dev>

crates/eval/examples/standardized_docker_dependency_checks/base.toml

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+url = "https://github.com/basecamp/kamal.git"
+revision = "0174b872bfc34b66852cffb58514ae079f21d299"
+language_extension = "rb"

crates/eval/examples/standardized_docker_dependency_checks/criteria.md

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+1. The changes introduce a new `DependencyError` class in `kamal/cli.rb` alongside other error classes like `BootError` and `HookError`. This new error class will be used to handle dependency-related failures.
+2. In `kamal/cli/base.rb`, a new method `ensure_docker_installed` is added which checks for Docker and buildx plugin installation locally. It raises the new `DependencyError` with appropriate messages if either Docker or buildx plugin are not found, replacing similar functionality that was previously scattered elsewhere.
+3. The `kamal/cli/build.rb` file is modified to use the new `ensure_docker_installed` method instead of the removed `verify_local_dependencies` method. The error handling is now consistent, using `DependencyError` instead of `BuildError` for dependency-related failures.
+4. The `kamal/cli/registry.rb` file now includes a call to `ensure_docker_installed` at the start of the login method, ensuring Docker is available before attempting registry operations.
+5. The `kamal/commands/base.rb` file adds a new public method `ensure_docker_installed` that combines checks for both Docker and buildx plugin installation, moving this functionality from the Builder class.
+6. The `kamal/commands/builder.rb` file is simplified by removing the `ensure_local_dependencies_installed` method and related private methods, as this functionality has been moved to the base commands class.
+7. Test files are updated to reflect these changes, with `build_test.rb` now expecting `DependencyError` instead of `BuildError` for dependency failures, and `registry_test.rb` adding a new test case for Docker dependency checking during login.

crates/eval/examples/standardized_docker_dependency_checks/prompt.md

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+I need to improve how our codebase handles Docker dependency checks and error reporting. Right now, the logic for verifying Docker and buildx installations is scattered across different classes, and the error messages aren't consistent. I'd like a more unified approach where we centralize these checks in a single place, making it easier to maintain and reuse. Additionally, we should introduce a dedicated error type for dependency-related failures instead of repurposing existing errors like BuildError. The changes should ensure that any command requiring Docker (like builds or registry logins) properly validates dependencies first, with clear error messages if something is missing. The solution should be clean, follow existing patterns in the codebase, and include any necessary test updates to reflect the new behavior.