[IMP] vcs/git: Downgrade warning when git clone on ref (#12282)

The warning is inconsistent as pip will not warn when cloning a branch
or tag which are mutable anyway.

Author: rousseldenis

news/12283.feature.rst

@@ -0,0 +1 @@
+Remove warning when cloning from a Git reference that does not look like a commit hash.

src/pip/_internal/vcs/git.py

@@ -236,7 +236,7 @@ def resolve_revision(
         # Do not show a warning for the common case of something that has
         # the form of a Git commit hash.
         if not looks_like_hash(rev):
-            logger.warning(
+            logger.info(
                 "Did not find branch or tag '%s', assuming revision or ref.",
                 rev,
             )

tests/unit/test_vcs.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 import os
 import pathlib
 from typing import Any
@@ -271,6 +272,7 @@ def test_git_resolve_revision_rev_not_found(get_sha_mock: mock.Mock) -> None:
 def test_git_resolve_revision_not_found_warning(
     get_sha_mock: mock.Mock, caplog: pytest.LogCaptureFixture
 ) -> None:
+    caplog.set_level(logging.INFO)
     get_sha_mock.return_value = (None, False)
     url = HiddenText("git+https://git.example.com", redacted="*")
     sha = 40 * "a"