collector.VERSION constant from pyproject.toml via importlib.metadata

[pda]

There should be a single source of truth for the version.

Prior to uv (#58) the setup.py file was loading the version attribute from the collector.VERSION constant... but pyproject.toml can't do that, so now we're doing it the other way around.

test-collector-python $ PYTHONPATH=src python -c 'from buildkite_test_collector.collector.constants import VERSION; print(VERSION)'
1.0.4

👌🏼

[Copilot]

Pull Request Overview

This PR implements a single source of truth for version management by loading the version from pyproject.toml via importlib.metadata instead of hardcoding it in constants. The change ensures version consistency between the package metadata and the collector's runtime version reporting.

Key changes:

• Replaces hardcoded version string with dynamic loading from package metadata
• Updates collector name to use a consistent format with the new distribution name constant
• Removes unused import in test file

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/buildkite_test_collector/collector/constants.py	Implements dynamic version loading from package metadata with fallback handling
src/buildkite_test_collector/collector/run_env.py	Updates collector name usage and removes pylint disable comment
tests/buildkite_test_collector/collector/test_run_env.py	Removes unused RunEnv import