Add flake8-implicit-str-concat rules to Ruff (#33191)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

examples/offline_inference/automatic_prefix_caching.py

@@ -26,7 +26,7 @@ from vllm import LLM, SamplingParams
 # A prompt containing a large markdown table. The table is randomly generated by GPT-4.
 LONG_PROMPT = (
     "You are a helpful assistant in recognizes the content of tables in markdown format. Here is a table as follows.\n# Table\n"
-    + """
+    """
 | ID  | Name          | Age | Occupation    | Country       | Email                  | Phone Number   | Address                       |
 |-----|---------------|-----|---------------|---------------|------------------------|----------------|------------------------------|
 | 1   | John Doe      | 29  | Engineer      | USA           | john.doe@example.com   | 555-1234       | 123 Elm St, Springfield, IL  |

examples/others/lmcache/disagg_prefill_lmcache_v1/disagg_proxy_server.py

@@ -69,10 +69,10 @@ class StatsCalculator:
         np_arr = np.array(self._stats)
         output_str = (
             f"\nNum requests: {len(self._stats)}"
-            + "\nPrefill node TTFT stats:"
-            + f"\n - Average (ms): {np.mean(np_arr)}"
-            + f"\n - Median (ms): {np.median(np_arr)}"
-            + f"\n - 99th Percentile (ms): {np.percentile(np_arr, 99)}\n"
+            "\nPrefill node TTFT stats:"
+            f"\n - Average (ms): {np.mean(np_arr)}"
+            f"\n - Median (ms): {np.median(np_arr)}"
+            f"\n - 99th Percentile (ms): {np.percentile(np_arr, 99)}\n"
         )
         print(
             "===============================",