SDAP-543: Migrate to uv for environment and dependency management

[MarcCruzs]

Caveat: Built and tested locally only. Two surfaces remain unverified:

1. Behavior in an AWS deployment
2. The config_operator Docker image build (only collection_manager and granule_ingester images were built and tested locally)

Summary

Migrates the ingester repo from its mixed legacy packaging (setuptools + requirements.txt for collection_manager/config_operator/common, and Poetry for granule_ingester) to a single uv workspace with one shared lockfile. All component Docker images are rebuilt on uv.

Supersedes the packaging approach from SDAP-511 (Poetry) and builds on SDAP-542 (Python 3.11).

What changed

Packaging & dependencies

• Added a root pyproject.toml defining a [tool.uv.workspace] with four members: common, collection_manager, config_operator, granule_ingester.
• Added a per-component pyproject.toml for each member
• removed the old setup.py / requirements.txt files and granule_ingester/poetry.lock.
• Single shared uv.lock at the repo root is now the source of truth for all resolved dependencies (replaces the per-component requirement files and the Poetry lock). Chose this route to reduce the maintenance needed to maintain dependencies.
• Pinned Python via .python-version and requires-python = ">=3.11,<3.12" across all components.

Docker

• All three Dockerfiles (collection_manager, config_operator, granule_ingester) rebuilt on uv using a two-phase uv sync (deps first for layer caching, then workspace packages). All are built from the repo root so uv can resolve the workspace.
• Entry points updated to run out of the uv-managed /app/.venv.

Package names (aligned with the previous published names)

• common is published as sdap_ingester_common and
  collection_manager as sdap_collection_manager, matching the
  PACKAGE_NAME values from the prior setup.py files. config_operator and
  granule_ingester keep their names. Import module names are unchanged
  (import common, import collection_manager).

config_operator

• main.py updated for kopf 1.x on Python 3.11 (HandlerFatalError →
  PermanentError)
• kopf pinned to >=1.36,<2.

Documentation & housekeeping

• READMEs for all components updated to the uv workflow (uv sync --package …,
  uv run --package …, repo-root docker build).
• Added .gitattributes and a root .dockerignore.
• CHANGELOG entry under [Unreleased].

Verification

• uv lock --check passes (75 packages, no drift).
• collection_manager image: builds from repo root
  • sdap-ingester-common installs
  • import common works
  • main.py -h runs.
• granule_ingester image: builds (Python-from-source + nexusproto)
  • sdap-ingester-common, nexusproto install, import common, import nexusproto, and main.py -h all succeed.
• config_operator image: not yet built/tested locally.

Notes

• config_operator's Repository URL is carried over verbatim from the prior repo metadata.
• CI workflows under .github/workflows/ are intentionally left unchanged in this PR.
• For Poetry migration to uv, utilized uvx migrate-to-uv (https://github.com/osprey-oss/migrate-to-uv)