Fix the exception sink test error message check. (pantsbuild#20655)

On my M1 I get a different message than apparently CI does.

So now we allow one of a set of messages to match, per platform.

Note that this error message check was already fragile, and the
exact nature of when we get each message is not understood, 
as admitted by a comment there. This PR doesn't address
the underlying problems with this test, but just gets things
working again without breaking things in CI or on other
platforms.

src/python/pants/base/exception_sink_test.py

@@ -40,31 +40,32 @@ def test_set_invalid_log_location():
         "created"
     ) in str(exc.value)
 
-    # NB: This target is marked with 'platform_specific_behavior' because OSX errors out here at
-    # creating a new directory with safe_mkdir(), Linux errors out trying to create the directory
+    # NB: This target is marked with 'platform_specific_behavior' because OSX may error out here at
+    # creating a new directory with safe_mkdir(), while Linux errors out trying to create the directory
     # for its log files with safe_open(). This may be due to differences in the filesystems.
     # TODO: figure out why we error out at different points here!
     with pytest.raises(ExceptionSink.ExceptionSinkError) as exc:
         sink.reset_log_location("/")
     err_str = {
         Platform.macos_arm64: (
             "The provided log location path at '/' is not writable or could not be created: "
-            "[Errno 21] Is a directory: '/'."
+            "[Errno 21] Is a directory: '/'.",
+            "Error opening fatal error log streams for log location '/': [Errno 30] Read-only file system",
         ),
         Platform.macos_x86_64: (
             "The provided log location path at '/' is not writable or could not be created: "
-            "[Errno 21] Is a directory: '/'."
+            "[Errno 21] Is a directory: '/'.",
         ),
         Platform.linux_arm64: (
             "Error opening fatal error log streams for log location '/': [Errno 13] Permission "
-            "denied:"
+            "denied:",
         ),
         Platform.linux_x86_64: (
             "Error opening fatal error log streams for log location '/': [Errno 13] Permission "
-            "denied:"
+            "denied:",
         ),
     }
-    assert match(Platform.create_for_localhost(), err_str) in str(exc.value)
+    assert any(s in str(exc.value) for s in match(Platform.create_for_localhost(), err_str))
 
 
 def test_log_exception():