Always skip `pyrepl` tests that contain `"can't use pyrepl"`

[sobolevn]

Bug report

Right now there's a pattern in https://github.com/python/cpython/blob/main/Lib/test/test_pyrepl/test_pyrepl.py

that looks like this:

output, exit_code = self.run_repl(commands, env=env)
if "can't use pyrepl" in output:
    self.skipTest("pyrepl not available")

We manually check the error message after run_repl call and then skip the test.
This design is prone to possible errors.

I propose to do this check in run_pyrepl itself.

Linked PRs

• gh-133054: Skip test_pyrepl tests when cannot use pyrepl is reported #133055
• [3.13] gh-133054: Skip test_pyrepl tests when cannot use pyrepl is reported (GH-133055) #133095