chore: enable cargo test in CI

[redpanda-f]

Enables Cargo test in CI, removes a bunch of examples in docstrings.

[Copilot]

Pull request overview

This PR enables running cargo test in CI and adjusts the codebase (primarily documentation and a few tests/constants) to reduce failures from doctests and test concurrency.

Changes:

• Added a dedicated GitHub Actions job to run cargo test --all-targets --all-features.
• Removed multiple docstring example blocks (likely to reduce/avoid doctest compilation/execution issues).
• Hardened src/paths.rs tests against cross-test env-var races by serializing env mutation with a mutex.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.github/workflows/ci.yml	Adds a new cargo-test job running cargo test.
src/version_info.rs	Removes docstring example for write_version_file.
src/run_id/persistence.rs	Removes docstring examples for run-id save/load helpers.
src/run_id/mod.rs	Removes docstring example for generate_run_id.
src/port_allocator.rs	Removes docstring example for PortAllocator.
src/paths.rs	Serializes tests that mutate FOC_DEVNET_BASEDIR using a global mutex.
src/embedded_assets.rs	Removes docstring example for extract_mockusdfc_project.
src/docker/command_logger.rs	Removes docstring example for format_command.
src/constants.rs	Updates container name constants from foc-c-* to foc-*.
src/commands/status/uptime.rs	Removes docstring examples for status helpers.
src/commands/status/running.rs	Removes docstring examples; updates a parsing test’s sample container names.
src/commands/status/git/repo_paths.rs	Fixes doc example to match current Location::GitBranch { .. } shape.
src/commands/status/git/git_info.rs	Removes docstring example for get_git_info.
src/commands/status/git/formatters.rs	Removes docstring example for format_location_info.
src/commands/start/step/mod.rs	Removes large docstring example for SetupContext/step usage and save_command.
src/commands/init/keys.rs	Updates test expectation for number of generated keys.

[Copilot]

The comment above these container name constants still says they’ll be prefixed with foc-c-<RUN_ID>-, but the codebase now uses foc-<RUN_ID>-<service> (and these constants are also used directly when no run ID is present). Please update this doc comment to reflect the actual naming scheme to avoid misleading future changes.

[Copilot]

extract_base_image_name currently splits on - and assumes the run ID contains no -. However save_current_run_id/tests in run_id::persistence accept hyphenated run IDs (e.g. "251203-1246-test-wolf"), which would make container names like foc-<run_id>-lotus parse incorrectly and return the wrong base image name. Consider making extract_base_image_name robust to - in the run ID (e.g., parse from the end or match known service suffixes), and add a test case that covers a hyphenated run ID to prevent regressions.

[Copilot]

This cargo test invocation will also run doctests; the repo currently has at least one runnable doctest in src/commands/status/mod.rs (module-level "Usage" example) that calls status::status() and will fail on a clean CI environment (requires an initialized config). Either mark that doctest as no_run/ignore (preferred) or adjust CI to avoid running doctests until the docs are fixed, otherwise this job is likely to be flaky/fail consistently.