remove invalid tests

With #12046, the `getLocale()` method isn't overriden anymore by the
`Translator` from the FrameworkBundle, but the locale is set by the
new `TranslatorListener`. Therefore, the tests ensuring the old
behavior are removed.
minor #12076 [FrameworkBundle] remove invalid tests (xabbuh)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[FrameworkBundle] remove invalid tests

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

With #12046, the `getLocale()` method isn't overriden anymore by the `Translator` from the FrameworkBundle, but the locale is set by the new `TranslatorListener`. Therefore, the tests ensuring the old behavior are removed.

Commits
-------

80d52c7 remove invalid tests