chore: remove the unused config INNER_API_KEY (#14780)

api/.env.example

 PLUGIN_REMOTE_INSTALL_PORT=5003
 PLUGIN_REMOTE_INSTALL_HOST=localhost
 PLUGIN_MAX_PACKAGE_SIZE=15728640
-INNER_API_KEY=QaHbTe77CtuXmsfyhR7+vRjI/+XbV1AaFy691iy+kGDv2Jvy0/eAh8Y1
 INNER_API_KEY_FOR_PLUGIN=QaHbTe77CtuXmsfyhR7+vRjI/+XbV1AaFy691iy+kGDv2Jvy0/eAh8Y1
 
 # Marketplace configuration

api/configs/feature/__init__.py

         default=False,
     )
 
-    INNER_API_KEY: Optional[str] = Field(
-        description="API key for accessing the internal API",
-        default=None,
-    )
-
 
 class LoggingConfig(BaseSettings):
     """

api/migrations/README

 Single-database configuration for Flask.
+

api/tests/integration_tests/.env.example

 # Plugin configuration
 PLUGIN_DAEMON_KEY=
 PLUGIN_DAEMON_URL=
-INNER_API_KEY=
 
 # Marketplace configuration
 MARKETPLACE_API_URL=