[FrameworkBundle] cache:clear command fills *.php.meta files with wrong data

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12110
| License       | MIT

Test and fix of ticket #12110
I wouldn't wrap the assertion.