Add block quantization e2e test (#1867)

SUMMARY:
Added e2e testing for block quantization.


TEST PLAN:
Tested locally with the following command:
```
python -m pytest tests/e2e/vLLM/test_vllm.py -vv -s
```

log:
```
================= vLLM GENERATION =================

PROMPT:
The capital of France is
GENERATED TEXT:
 Paris, which is located in the Île-de-France region. The

PROMPT:
The president of the US is
GENERATED TEXT:
 paying for the protests against him. The White House has reportedly cut

PROMPT:
My name is
GENERATED TEXT:
 [insert name], and I am a [insert job title]. I am excited

PASSED

===================================================================================================================== 1 passed in 130.10s (0:02:10) =====================================================================================================================
```

---------

Signed-off-by: shanjiaz <zsjwpianpian@gmail.com>

Author: shanjiaz

tests/e2e/vLLM/configs/fp8_block.yaml

@@ -0,0 +1,4 @@
+cadence: "nightly"
+test_type: "regression"
+model: TinyLlama/TinyLlama-1.1B-Chat-v1.0
+scheme: FP8_BLOCK