vertexai: Add `embeddings_task_type` parameter to `embed_query` and `embed_documents` #2273

Job	Run time
build	5s
cd libs/vertexai / (Check for spelling errors)	10s
cd libs/vertexai / - / make lint #3.9	2m 37s
cd libs/vertexai / - / make test #3.9	17s
cd libs/vertexai / - / make lint #3.12	2m 44s
cd libs/vertexai / - / make test #3.10	21s
cd libs/vertexai / - / poetry run pytest -m compile tests/integration_tests #3.9	14s
cd libs/vertexai / - / make test #3.11	22s
cd libs/vertexai / - / poetry run pytest -m compile tests/integration_tests #3.10	21s
cd libs/vertexai / - / make test #3.12	15s
cd libs/vertexai / - / poetry run pytest -m compile tests/integration_tests #3.11	20s
cd libs/vertexai / - / poetry run pytest -m compile tests/integration_tests #3.12	21s
	8m 7s

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