minor #10136 [DependencyInjection] Remove unneeded file (florianv)

This PR was merged into the 2.3 branch.

Discussion
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[DependencyInjection] Remove unneeded file

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

I think the file was moved here by mistake from the fixtures.

Commits
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caf1809 [DependencyInjection] Remove unneeded file