fix(google-common, google-vertexai): Invalid URL for embeddings model #7406
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The URL path for Vertex AI typically includes a publisher name.
For LLMs, this publisher name is determined based on model name.
For embeddings, the publisher name never matched, so was assigned a name of "unknown".
Oddly enough, in some regions and with some embedding models - this was fine. But in other regions, this returned an error.
Fix is to make sure that all embedding models (at least for now) are considered published by Google.
Fixes #7390