tests : refactor test-backend-sampler (ggml-org#18753)

* tests : use "auto", use std::string

* tests : refactor test-backend-sampler.cpp

* cmake : remove redundant declarations

* ci : use smaller model

* tests : add struct test_params

* tests : reduce logit bias 100.0f -> 10.0f

Author: ggerganov

ci/run.sh

@@ -297,7 +297,8 @@ function gg_sum_test_scripts {
 }
 
 function gg_get_model {
-    local gguf_0="$MNT/models/qwen3/0.6B/ggml-model-f16.gguf"
+    #local gguf_0="$MNT/models/qwen3/0.6B/ggml-model-f16.gguf"
+    local gguf_0="$MNT/models/qwen3/0.6B/ggml-model-q4_0.gguf"
     if [[ -s $gguf_0 ]]; then
         echo -n "$gguf_0"
     else

tests/CMakeLists.txt

@@ -223,15 +223,6 @@ llama_build_and_test(test-model-load-cancel.cpp LABEL "model")
 llama_build_and_test(test-autorelease.cpp       LABEL "model")
 llama_build_and_test(test-backend-sampler.cpp   LABEL "model")
 
-llama_test(test-backend-sampler NAME test-backend-sampler-greedy       ARGS --test greedy)
-llama_test(test-backend-sampler NAME test-backend-sampler-temp         ARGS --test temp)
-llama_test(test-backend-sampler NAME test-backend-sampler-top_k        ARGS --test top_k)
-llama_test(test-backend-sampler NAME test-backend-sampler-dist         ARGS --test dist)
-llama_test(test-backend-sampler NAME test-backend-sampler-dist-and-cpu ARGS --test dist_and_cpu)
-llama_test(test-backend-sampler NAME test-backend-sampler-logit-bias   ARGS --test logit_bias)
-llama_test(test-backend-sampler NAME test-backend-sampler-mul_seq      ARGS --test multi_sequence)
-llama_test(test-backend-sampler NAME test-backend-sampler-set-sampler  ARGS --test set_sampler)
-
 # Test for state restore with fragmented KV cache
 # Requires a model, uses same args pattern as test-thread-safety
 if (NOT ${CMAKE_SYSTEM_PROCESSOR} MATCHES "s390x")