Tweak error messages of some SoltestErrors

Author: cameel

test/FilesystemUtils.cpp

@@ -84,7 +84,7 @@ bool solidity::test::createSymlinkIfSupportedByFilesystem(
 		return false;
 	else
 		solThrow(ExecutionError, fmt::format(
-			"Failed to create a symbolic link: \"{}\" -> {}\". {}.",
+			"Failed to create a symbolic link: \"{}\" -> \"{}\". {}.",
 			_linkName.string(),
 			_targetPath.string(),
 			symlinkCreationError.message()

test/TestCaseReader.h

@@ -96,7 +96,8 @@ E TestCaseReader::enumSetting(std::string const& _name, std::map<std::string, E>
 	std::string value = stringSetting(_name, _defaultChoice);
 
 	solRequire(_choices.count(value) != 0, solidity::test::ValidationError, fmt::format(
-		"Invalid Enum value: {}. Available choices: {}.",
+		"Invalid choice in '{}' setting: {}.\nAvailable choices: {}.",
+		_name,
 		value,
 		util::joinHumanReadable(_choices | ranges::views::keys)
 	));

test/libyul/Common.cpp

@@ -118,7 +118,7 @@ yul::Dialect const& yul::test::dialect(std::string const& _name, langutil::EVMVe
 {
 	if (!validDialects.count(_name))
 		solThrow(ValidationError, fmt::format(
-			"Invalid Dialect \"{}\". Valid dialects are {}.",
+			"Invalid Dialect \"{}\". Valid dialects: {}.",
 			_name,
 			util::joinHumanReadable(validDialectNames(), ", ", " and ")
 		));