LCORE-1426: label flaky inline RAG e2e tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: are-ces

tests/e2e/features/inline_rag.feature

@@ -22,6 +22,7 @@ Feature: Inline RAG (BYOK) support tests
     }
     """
 
+  @flaky
   Scenario: Query with inline RAG returns relevant content
     When I use "query" to ask question with authorization header
     """
@@ -33,6 +34,7 @@ Feature: Inline RAG (BYOK) support tests
          | great work                |
      And The response contains non-empty rag_chunks
 
+  @flaky
   Scenario: Inline RAG query includes referenced documents
     When I use "query" to ask question with authorization header
     """
@@ -41,6 +43,7 @@ Feature: Inline RAG (BYOK) support tests
     Then The status code of the response is 200
      And The response contains non-empty referenced_documents
 
+  @flaky
   Scenario: Streaming query with inline RAG returns relevant content
     When I use "streaming_query" to ask question with authorization header
     """
@@ -52,6 +55,7 @@ Feature: Inline RAG (BYOK) support tests
          | Fragments in LLM response |
          | great work                |
 
+  @flaky
   Scenario: Responses API with inline RAG returns relevant content
     When I use "responses" to ask question with authorization header
     """
@@ -62,6 +66,7 @@ Feature: Inline RAG (BYOK) support tests
          | Fragments in LLM response |
          | great work                |
 
+  @flaky
   Scenario: Streaming Responses API with inline RAG returns relevant content
     When I use "responses" to ask question with authorization header
     """