Remove base url validation (#18031)

...x-embeddings-nvidia/llama_index/embeddings/nvidia/base.py

...s/embeddings/llama-index-embeddings-nvidia/pyproject.toml

...ings/llama-index-embeddings-nvidia/tests/test_base_url.py

...s/llama-index-llms-nvidia/llama_index/llms/nvidia/base.py

...-integrations/llms/llama-index-llms-nvidia/pyproject.toml

...ia-rerank/llama_index/postprocessor/nvidia_rerank/base.py

...or/llama-index-postprocessor-nvidia-rerank/pyproject.toml

...-index-postprocessor-nvidia-rerank/tests/test_base_url.py