Fix: Adds newest Gemini models to fit google's standard API rate limits (#8970)

### What problem does this PR solve?

Adds configurations for gemini-2.5-flash and Gemini 2.5-pro models,
including tags, maximum token limits, and model types.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

conf/llm_factories.json

             "tags": "LLM,TEXT EMBEDDING,IMAGE2TEXT",
             "status": "1",
             "llm": [
+                {
+                    "llm_name": "gemini-2.5-flash",
+                    "tags": "LLM,CHAT,1024K,IMAGE2TEXT",
+                    "max_tokens": 1048576,
+                    "model_type": "image2text",
+                    "is_tools": true
+                },
+                {
+                    "llm_name": "gemini-2.5-pro",
+                    "tags": "LLM,CHAT,IMAGE2TEXT,1024K",
+                    "max_tokens": 1048576,
+                    "model_type": "image2text",
+                    "is_tools": true
+                },
                 {
                     "llm_name": "gemini-2.5-flash-preview-05-20",
                     "tags": "LLM,CHAT,1024K,IMAGE2TEXT",