[TwigBridge] remove empty testcase class
merged branch Tobion/twig-bridge-testcase (PR #9057)

This PR was merged into the master branch.

Discussion
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[TwigBridge] remove empty testcase class

since de50621e8ac3 this class is useless

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

Commits
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f6a1606 [TwigBridge] remove empty testcase class