FIX: Properly pass missing vectorize params in Astra DB

[erichare]

This pull request cleans up some of the authentication parameters, properly passing a None value with the authentication is empty to allow for connecting to a vector store generated with NVIDIA vectorize

[codspeed-hq]

CodSpeed Performance Report

Merging #4511 will degrade performances by 10.08%

_{Comparing bugfix-vectorize-params (e560007) with main (aea9804)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 13 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	bugfix-vectorize-params	Change
⚡	test_invalid_run_with_input_type_chat	18 ms	14 ms	+28.89%
❌	test_successful_run_with_output_type_debug	410.2 ms	456.2 ms	-10.08%

[Cristhianzl]

lgtm