tests : improve UGM tokenizer test coverage (#13773)

models/ggml-vocab-nomic-bert-moe.gguf.inp

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+ied 4 ½ months
+__ggml_vocab_test__
+Führer
+__ggml_vocab_test__
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+__ggml_vocab_test__
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+__ggml_vocab_test__
+  
+__ggml_vocab_test__
+   
+__ggml_vocab_test__
+	
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+__ggml_vocab_test__
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+__ggml_vocab_test__
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+__ggml_vocab_test__
+	
+
+__ggml_vocab_test__
+Hello world
+__ggml_vocab_test__
+ Hello world
+__ggml_vocab_test__
+Hello World
+__ggml_vocab_test__
+ Hello World
+__ggml_vocab_test__
+ Hello World!
+__ggml_vocab_test__
+Hello, world!
+__ggml_vocab_test__
+ Hello, world!
+__ggml_vocab_test__
+ this is 🦙.cpp
+__ggml_vocab_test__
+w048 7tuijk dsdfhu
+__ggml_vocab_test__
+нещо на Български
+__ggml_vocab_test__
+កាន់តែពិសេសអាចខលចេញ
+__ggml_vocab_test__
+🚀 (normal) 😶‍🌫️ (multiple emojis concatenated) ✅ (only emoji that has its own token)
+__ggml_vocab_test__
+Hello
+__ggml_vocab_test__
+ Hello
+__ggml_vocab_test__
+  Hello
+__ggml_vocab_test__
+   Hello
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+    Hello
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+    Hello
+    Hello
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+ (
+__ggml_vocab_test__
+
+ =
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+' era
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+Hello, y'all! How are you 😁 ?我想在apple工作1314151天～
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+!!!!!!
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+3
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+33
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+333
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+3333
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+33333
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+333333
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+3333333
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+33333333
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+333333333
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+Cửa Việt
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+ discards
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+ 	 		 	
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+🚀 (normal) 😶‍🌫️ (multiple emojis concatenated) ✅ 🦙🦙 3 33 333 3333 33333 333333 3333333 33333333 3.3 3..3 3...3 កាន់តែពិសេសអាច😁 ?我想在apple工作1314151天～ ------======= нещо на Български ''''''```````""""......!!!!!!?????? I've been 'told he's there, 'RE you sure? 'M not sure I'll make it, 'D you like some tea? We'Ve a'lL
+__ggml_vocab_test__