[HttpFoundation] moved test file to the right directory
minor #11462 [HttpFoundation] moved test file to the right directory (fabpot)

This PR was merged into the 2.5 branch.

Discussion
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[HttpFoundation] moved test file to the right directory

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

Commits
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a260623 [HttpFoundation] moved test file to the right directory