[YAML] resolve variables in inlined YAML

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11665
| License       | MIT
| Doc PR        | 

#11569 does not resolve variables in inline YAML.
We run into a problem upgrading to 2.5.4 which contains this PR. Our - previously invalid - YAML contained unescaped asterix character both as a key and value in several places. After upgrading, this call raised php warnings about the first parameter.

eg: `arguments: [ * ]`