Use optimized versions of managed Python on Linux (#4775)

Fix #4774.

## Summary

Change the python interpreter for linux installed with `uv python` to an
optimized one.

## Test Plan

I ran the following command on Linux (glibc) to confirm that an
optimized (not debug built) Python is installed.

```bash
# install python
uv python install 3.12.3

# check build type
uv run python -c "import sysconfig;print(sysconfig.get_config_var('Py_DEBUG'))"
0
```

crates/uv-python/fetch-download-metadata.py

@@ -36,9 +36,6 @@ FLAVOR_PREFERENCES = [
     "shared-noopt",
     "shared-noopt",
     "static-noopt",
-    "gnu-pgo+lto",
-    "gnu-lto",
-    "gnu-pgo",
     "pgo+lto",
     "lto",
     "pgo",