`pip_compile`: Prefer `uv export` over `uv pip compile` to respect default `[dependency-groups]`

[hterik]

Given a pyproject.toml with dependency-groups, eg

[dependency-groups]
group-a = [
    "requests"
]
group-b = []

[tool.uv]
default-groups = ["group-a"]

• uv export respects the default-groups and produces a requirements.in containing requests and transitive dependencies
• uv pip compile on the other hand generates an empty file.

The pip_compile rule is using uv pip compile and hence misses the groups.