Remove redundant `python_sources` targets (#10922)

llama-index-cli/BUILD

llama-index-cli/llama_index/cli/new_package/common/BUILD

...re/llama_index/core/command_line/new_package/common/BUILD

llama-index-core/tests/BUILD

llama-index-core/tests/agent/openai/BUILD

llama-index-core/tests/indices/BUILD

llama-index-core/tests/indices/list/BUILD

llama-index-core/tests/indices/query/query_transform/BUILD

llama-index-core/tests/indices/response/BUILD

llama-index-core/tests/llms/BUILD

llama-index-core/tests/node_parser/BUILD

llama-index-core/tests/storage/docstore/BUILD

llama-index-core/tests/storage/index_store/BUILD

llama-index-core/tests/storage/kvstore/BUILD

llama-index-core/tests/vector_stores/BUILD

...ntegrations/callbacks/llama-index-callbacks-argilla/BUILD

...tions/callbacks/llama-index-callbacks-arize-phoenix/BUILD

...tegrations/embeddings/llama-index-embeddings-gemini/BUILD

...ions/embeddings/llama-index-embeddings-gemini/tests/BUILD

...tegrations/embeddings/llama-index-embeddings-google/BUILD