fix(copilot): add max_tokens_exceeded to prompt-too-long patterns

The pattern was missing from _PROMPT_TOO_LONG_PATTERNS, causing
test_max_tokens_exceeded and test_all_patterns to fail. Also sync
test_all_patterns with the full pattern list (add input tokens exceed).

autogpt_platform/backend/backend/copilot/sdk/service.py

@@ -103,6 +103,7 @@ _PROMPT_TOO_LONG_PATTERNS: tuple[str, ...] = (
     "request too large",
     "maximum context length",
     "context_length_exceeded",
+    "max_tokens_exceeded",
     "input tokens exceed",
     "input is too long",
     "content length exceeds",

autogpt_platform/backend/backend/copilot/sdk/service_helpers_test.py

@@ -89,6 +89,7 @@ class TestIsPromptTooLong:
             "maximum context length",
             "context_length_exceeded",
             "max_tokens_exceeded",
+            "input tokens exceed",
             "input is too long",
             "content length exceeds",
         ]