[RHELC-568] docs: improve failed conversion message (#637)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

convert2rhel/main.py

@@ -163,7 +163,13 @@ def main():
             # system rollback without user intervention. If a proper rollback
             # solution is necessary it will need to be future implemented here
             # or with the use of other backup tools.
-            loggerinst.warning("Conversion process interrupted and manual user intervention will be necessary.")
+            loggerinst.warning(
+                "The conversion process failed.\n\n"
+                "The system is left in an undetermined state that Convert2RHEL cannot fix. The system might not be"
+                " fully converted, and might incorrectly be reporting as a Red Hat Enterprise Linux machine.\n\n"
+                "It is strongly recommended to store the Convert2RHEL logs for later investigation, and restore"
+                " the system from a backup."
+            )
             subscription.update_rhsm_custom_facts()
         return 1
 

convert2rhel/unit_tests/main_test.py

@@ -593,7 +593,5 @@ def test_main_rollback_post_ponr_changes_phase(monkeypatch, caplog):
     assert ask_to_continue_mock.call_count == 1
     assert post_ponr_conversion_mock.call_count == 1
     assert finish_collection_mock.call_count == 1
-    assert (
-        "Conversion process interrupted and manual user intervention will be necessary." in caplog.records[-1].message
-    )
+    assert "The system is left in an undetermined state that Convert2RHEL cannot fix." in caplog.records[-1].message
     assert update_rhsm_custom_facts_mock.call_count == 1