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Improve Python discovery source messages (#8890)

Browse source 
e.g.

```
❯ echo "anyio" |  cargo run -q -- pip compile - -v
DEBUG uv 0.4.30 (107ab3d71 2024-11-07)
DEBUG Starting Python discovery for a default Python
DEBUG Looking for exact match for request a default Python
DEBUG Searching for default Python interpreter in virtual environments, managed installations, or search path
DEBUG Found `cpython-3.12.7-macos-aarch64-none` at `/Users/zb/workspace/uv/.venv/bin/python3` (virtual environment)
```
```
❯ cargo run -q -- pip install anyio -v
DEBUG uv 0.4.30 (107ab3d71 2024-11-07)
DEBUG Searching for default Python interpreter in virtual environments
DEBUG Found `cpython-3.12.7-macos-aarch64-none` at `/Users/zb/workspace/uv/.venv/bin/python3` (virtual environment)
```

vs

```
❯ uv  pip install anyio -v
DEBUG uv 0.4.30 (61ed2a236 2024-11-04)
DEBUG Searching for default Python interpreter in system path
DEBUG Found `cpython-3.12.7-macos-aarch64-none` at `/Users/zb/workspace/uv/.venv/bin/python3` (virtual environment)
```

```
❯ echo "anyio" | uv pip compile - -v
DEBUG uv 0.4.30 (61ed2a236 2024-11-04)
DEBUG Starting Python discovery for a default Python
DEBUG Looking for exact match for request a default Python
DEBUG Searching for default Python interpreter in managed installations or system path
DEBUG Found `cpython-3.12.7-macos-aarch64-none` at `/Users/zb/workspace/uv/.venv/bin/python3` (virtual environment)
```
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Zanie Blue 2024-11-07 14:08:49 -06:00 • committed by GitHub
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docs/reference/cli.md
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@ -4142,7 +4142,7 @@ environment is not required, uv will then search for a Python interpreter. Pytho
interpreters are found by searching for Python executables in the `PATH` environment
variable.
On Windows, the `py` launcher is also invoked to find Python executables.
On Windows, the registry is also searched for Python executables.
By default, uv will download Python if a version cannot be found. This behavior can be
disabled with the `--no-python-downloads` flag or the `python-downloads` setting.