bug #36501 [DX] Show the ParseException message in all YAML file loaders (fancyweb)

This PR was merged into the 3.4 branch.

Discussion
----------

[DX] Show the ParseException message in all YAML file loaders

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

This PR synchronizes the exception message in the Routing, Validator and Translation YAML file loaders with the DependencyInjection YAML file loader behavior. Adding the ParseException message is a big DX gain because it highlights the problem directly instead of having to scroll down 7 previous exceptions.

I'm targetting 3.4 because DX can be considered as a bug fix AFAIK.

Commits
-------

fc6cf3d3c6 [DX] Show the ParseException message in YAML file loaders

Author: nicolas-grekas

Mapping/Loader/YamlFileLoader.php

@@ -124,7 +124,7 @@ private function parseFile($path)
         try {
             $classes = $this->yamlParser->parseFile($path, Yaml::PARSE_CONSTANT);
         } catch (ParseException $e) {
-            throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
+            throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML', $path).': '.$e->getMessage(), 0, $e);
         } finally {
             restore_error_handler();
         }