Suppress UserWarning when finding module specs (#2121) (#2122)

Found when linting this code:
```
import setuptools
import pip
```

(cherry picked from commit 6723e63)

Co-authored-by: Jacob Walls <[email protected]>

ChangeLog

@@ -16,6 +16,10 @@ Release date: TBA
 
   Closes #1735
 
+* Suppress ``UserWarning`` when finding module specs.
+
+  Closes pylint-dev/pylint#7906
+
 
 What's New in astroid 2.15.2?
 =============================

astroid/interpreter/_import/spec.py

@@ -13,6 +13,7 @@
 import pathlib
 import sys
 import types
+import warnings
 import zipimport
 from collections.abc import Iterator, Sequence
 from pathlib import Path
@@ -147,7 +148,9 @@ def find_module(
             )
         else:
             try:
-                spec = importlib.util.find_spec(modname)
+                with warnings.catch_warnings():
+                    warnings.filterwarnings("ignore", category=UserWarning)
+                    spec = importlib.util.find_spec(modname)
                 if (
                     spec
                     and spec.loader  # type: ignore[comparison-overlap] # noqa: E501

tests/test_manager.py

@@ -7,6 +7,7 @@
 import sys
 import time
 import unittest
+import warnings
 from collections.abc import Iterator
 from contextlib import contextmanager
 from unittest import mock
@@ -383,6 +384,15 @@ def test_raises_exception_for_empty_modname(self) -> None:
             self.manager.ast_from_module_name(None)
 
 
+class IsolatedAstroidManagerTest(resources.AstroidCacheSetupMixin, unittest.TestCase):
+    def test_no_user_warning(self):
+        mgr = manager.AstroidManager()
+        with warnings.catch_warnings():
+            warnings.filterwarnings("error", category=UserWarning)
+            mgr.ast_from_module_name("setuptools")
+            mgr.ast_from_module_name("pip")
+
+
 class BorgAstroidManagerTC(unittest.TestCase):
     def test_borg(self) -> None:
         """Test that the AstroidManager is really a borg, i.e. that two different