Add pypi.org as explicit default index for uv in pre-commit (#4167)

* Add pypi.org as explicit default index for uv

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* try modifying uv.lock pointing to artifact registry -- ci should fail

* try uv lock before

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* try wrong uv.lock

* test

* test

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* final test with wrong uv.lock -- precommit job should fail again

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

* fix uv.lock -- ci should pass

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

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Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>