test: work around modern pytest rejecting site-packages

Modern (as of Fedora 37) pytest has the "-sP" flags in the Python command
line, as found in /usr/bin/pytest. This means it will reject the
site-packages directory, where we install the Scylla Python driver. This
causes all the tests to fail.

Work around it by supplying an alternative pytest script that does not
have this change.

Closes #11764

test.py

@@ -613,7 +613,7 @@ class CQLApprovalTest(Test):
     def __init__(self, test_no: int, shortname: str, suite) -> None:
         super().__init__(test_no, shortname, suite)
         # Path to cql_repl driver, in the given build mode
-        self.path = "pytest"
+        self.path = "./test/pytest"
         self.cql = suite.suite_path / (self.shortname + ".cql")
         self.result = suite.suite_path / (self.shortname + ".result")
         self.tmpfile = os.path.join(suite.options.tmpdir, self.mode, self.uname + ".reject")
@@ -769,7 +769,7 @@ class PythonTest(Test):
 
     def __init__(self, test_no: int, shortname: str, suite) -> None:
         super().__init__(test_no, shortname, suite)
-        self.path = "pytest"
+        self.path = "./test/pytest"
         self.xmlout = os.path.join(self.suite.options.tmpdir, self.mode, "xml", self.uname + ".xunit.xml")
         self.server_log: Optional[str] = None
         self.server_log_filename: Optional[pathlib.Path] = None

test/pytest

@@ -0,0 +1,7 @@
+#!/bin/sh -e
+
+# Modern pytest excludes site-packages, so it doesn't see scylla-driver.
+# This script is a workaround.
+
+exec python -m pytest "$@"
+