CraftError messages with new lines render inconsistently

### Bug Description

If the `message` field in a `CraftError` contains a new line, craft-cli appears to append whitespace, which causes the appearance of a new line between the `message` and `resolution` sections.

Note that I cannot use the `details` field because `details` isn't visible at the default `brief` verbosity level.

### To Reproduce

```diff
diff --git a/examples.py b/examples.py
index c842a1a..c7fe76e 100755
--- a/examples.py
+++ b/examples.py
def example_10():
@@ -513,6 +516,15 @@ def example_30():
time.sleep(0.001)

+def example_31():
+ """Show an error."""
+ path = "/dev/null"
+ raise CraftError(
+ message="Remote build does not support building multiple snaps on the same architecture:\n - Building on 'amd64' will create snaps for 'amd64' and 'riscv64'.",
+ resolution="this is the resolution",
+ )
+
+
# -- end of test cases

if len(sys.argv) < 2:
```

### part yaml

_No response_

### Relevant log output

See the attached pictures. The same photo is highlighted to show what appears to be extraneous whitespace.



Reproduce the behavior using example_31 in examples.py and inspect how CraftError renders its message and resolution at the default brief verbosity. Done means a message containing a newline no longer produces inconsistent or extraneous whitespace before the resolution section.

Written by the indexing model from the issue text.