fix(openai): update `AzureOpenAIEmbeddings` validation logic for `ope… #5121

Job	Run time
Benchmark (libs/core, walltime)	1m 19s
Benchmark (libs/partners/mistralai)	2m 39s
Benchmark (libs/partners/xai)	5m 3s
Benchmark (libs/partners/deepseek)	2m 55s
Benchmark (libs/partners/fireworks)	8m 19s
Benchmark (libs/partners/groq)	3m 24s
Benchmark (libs/partners/openai)	7m 10s
Benchmark (libs/partners/anthropic)	2m 38s
	33m 27s

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