fix: correct VertexAI endpoint generation for 'global' location #11853
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Fixes #11845
This PR fixes a bug where setting the location to
"global"resulted in the generation of an incorrect API endpoint (global-aiplatform.googleapis.com).The "global" location is a special case in Vertex AI and should map to the regional-agnostic endpoint
aiplatform.googleapis.com, rather than following the standard{location}-aiplatform.googleapis.compattern.VertexAI.javato explicitly handle the"global"location string during endpoint construction.testInstantiateVertexAI_builderLocationFromGLOBAL_REGION_shouldContainRightFields