Fix SSR mode flag with `mount_gradio_app` and revert changes to pytests (#9446)
* Revert "Fix Python unit tests on `5.0-dev` branch (#9432)"
This reverts commit b0f46d238e7b917e4411c67a7a0d9cb795b9bcd4.
* revert changes to pytest
* add changeset
* fix
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