[lldb][test] Enable TestRerunAndExprDyLib (swiftlang#11530)

* [lldb][test] Re-enable `TestRerunAndExprDylib.py` (llvm#157872)

the `skipTestIfFn` requires a function that return a string to skip or
None to run the test. The `isUbuntu18_04` function returns a bool and
the test is skipped on all platforms.

(cherry picked from commit f5315bd)

* [lldb][test] skip test `TestRerunAndExprDylib.py` on remote (llvm#157916)

(cherry picked from commit 55e99ef)

Author: da-viper

lldb/test/API/functionalities/rerun_and_expr_dylib/TestRerunAndExprDylib.py

@@ -20,14 +20,15 @@ def isUbuntu18_04():
             with open(path) as f:
                 contents = f.read()
             if "Ubuntu 18.04" in contents:
-                return True
+                return "Ubuntu 18.04 is not supported."
 
-    return False
+    return None
 
 
 class TestRerunExprDylib(TestBase):
     @skipTestIfFn(isUbuntu18_04, bugnumber="rdar://103831050")
     @skipIfWindows
+    @skipIfRemote
     def test(self):
         """
         Tests whether re-launching a process without destroying