fix(cli): Add validation for search-mode parameter (#1026)

This minor PR will add validation check for the search-mode parameter. Originally i tried to run the `cuvs_bench` as following 
```
python -m cuvs_bench.run --dataset fbv6_50m --algorithms cuvs_cagra --batch-size 100 -k 10
Enter the path to dataset folder [/opt/conda/lib/python3.10/site-packages/cuvs_bench/run/datasets/]: /data/benchmarks/cuvs_experiments/datasets
Enter the comma separated groups of parameters [base]: base
Enter the search mode ("latency" or "throughput") [latency]: througput
/opt/conda/lib/python3.10/site-packages/cuvs_bench/run/run.py:187: UserWarning: Could not load YAML config
```
As you can see, I had the typo in this line `Enter the search mode ("latency" or "throughput") [latency]: througput` missing `h` and it defaulted to `latency`. This PR would print error if there's anything else specified other than `latency` or `throughput`.

Authors:
  - https://github.com/mayani-nv
  - Divye Gala (https://github.com/divyegala)
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Divye Gala (https://github.com/divyegala)
  - Tarang Jain (https://github.com/tarang-jain)

URL: #1026

Author: mayani-nv

python/cuvs_bench/cuvs_bench/run/__main__.py

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2024, NVIDIA CORPORATION.
+# Copyright (c) 2024-2025, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -112,6 +112,7 @@
 @click.option(
     "-m",
     "--search-mode",
+    type=click.Choice(["latency", "throughput"], case_sensitive=False),
     default="latency",
     show_default=True,
     prompt='Enter the search mode ("latency" or "throughput")',
@@ -135,7 +136,7 @@
     "--dry-run",
     is_flag=True,
     help="Dry-run mode will convert the yaml config for the specified "
-    "algorithms and datasets to the json format that’s consumed "
+    "algorithms and datasets to the json format that's consumed "
     "by the lower-level c++ binaries and then print the command to "
     "run execute the benchmarks but will not actually execute "
     "the command.",