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perf(build): switch from pip to uv DEV-1282 (#6467)

Switch to `uv` as a drop-in replacement for `pip-tools`. 

Use `uv pip install`, `uv pip sync`, and `uv pip compile` instead of the
pip equivalents.

With this update, we no longer install `pip-tools` in the container.

The Docker base image has switched from `python:3.10-bookworm` to
`ghcr.io/astral-sh/uv:python3.10-bookworm`, which includes `uv` and sets
`UV_TOOL_BIN_DIR=/usr/local/bin`.

---

- Container, CI: Use vendor image that includes uv, use vendor action
that installs uv.
- `pip/dependencies`: Remove -e (editable git repositories) for uv
compatibility.
- Dockerfile, docker-entrypoint, actions: Use uv commands instead of
pip.
- Dockerfile: No longer includes pip-tools.

Result:

- CI saves about a minute for `pytest` and `drf-spectacular`
- Container builds save about a minute.
- `kobo-install` still syncs dependencies automatically — it is
noticeably faster.

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