Remove the is_copilot flag in favor of using the autodetected client

In the copilot provider, we can hardcode the client type to copilot when
instantiating the pipelines.

Related: #830

Author: jhrozek

src/codegate/pipeline/base.py

@@ -350,7 +350,6 @@ async def process_request(
         api_key: Optional[str] = None,
         api_base: Optional[str] = None,
         extra_headers: Optional[Dict[str, str]] = None,
-        is_copilot: bool = False,
     ) -> PipelineResult:
         """Process a request through all pipeline steps"""
         self.context.metadata["extra_headers"] = extra_headers
@@ -362,7 +361,9 @@ async def process_request(
         self.context.sensitive.api_base = api_base
 
         # For Copilot provider=openai. Use a flag to not clash with other places that may use that.
-        provider_db = "copilot" if is_copilot else provider
+        provider_db = provider
+        if self.context.client == ClientType.COPILOT:
+            provider_db = "copilot"
 
         for step in self.pipeline_steps:
             result = await step.process(current_request, self.context)
@@ -419,9 +420,13 @@ async def process_request(
         api_key: Optional[str] = None,
         api_base: Optional[str] = None,
         extra_headers: Optional[Dict[str, str]] = None,
-        is_copilot: bool = False,
     ) -> PipelineResult:
         """Create a new pipeline instance and process the request"""
         return await self.instance.process_request(
-            request, provider, model, api_key, api_base, extra_headers, is_copilot
+            request,
+            provider,
+            model,
+            api_key,
+            api_base,
+            extra_headers,
         )

src/codegate/providers/copilot/pipeline.py

@@ -114,7 +114,6 @@ async def process_body(
                 api_key=headers_dict.get("authorization", "").replace("Bearer ", ""),
                 api_base="https://" + headers_dict.get("host", ""),
                 extra_headers=CopilotPipeline._get_copilot_headers(headers_dict),
-                is_copilot=True,
             )
         except Exception as e:
             logger.error(f"Pipeline processing error: {e}")