model-conversion : add BUILD_DIR variable to run-converted-model scripts (#18927)

This commit adds a BUILD_DIR variable to the scripts used for running
converted models.

The motivation for this is that currently the `build` directory is
hardcoded and it can be useful to specify a different build directory,
with builds for different configurations.

examples/model-conversion/scripts/embedding/run-converted-model.sh

@@ -28,6 +28,7 @@ done
 
 # First try command line argument, then environment variable
 CONVERTED_MODEL="${CONVERTED_MODEL:-"$CONVERTED_EMBEDDING_MODEL"}"
+BUILD_DIR="${BUILD_DIR:-"../../build"}"
 
 # Final check if we have a model path
 if [ -z "$CONVERTED_MODEL" ]; then
@@ -50,5 +51,5 @@ fi
 
 echo $CONVERTED_MODEL
 
-cmake --build ../../build --target llama-debug -j8
-../../build/bin/llama-debug -m "$CONVERTED_MODEL" --embedding -p "$PROMPT" --save-logits --embd-normalize $EMBD_NORMALIZE
+cmake --build ${BUILD_DIR} --target llama-debug -j8
+${BUILD_DIR}/bin/llama-debug -m "$CONVERTED_MODEL" --embedding -p "$PROMPT" --save-logits --embd-normalize $EMBD_NORMALIZE