refactor(test): move tools, evals, datasetio, scoring and post training tests (#1401)

All of the tests from `llama_stack/providers/tests/` are now moved to
`tests/integration`.

I converted the `tools`, `scoring` and `datasetio` tests to use API.
However, `eval` and `post_training` proved to be a bit challenging to
leaving those. I think `post_training` should be relatively
straightforward also.

As part of this, I noticed that `wolfram_alpha` tool wasn't added to
some of our commonly used distros so I added it. I am going to remove a
lot of code duplication from distros next so while this looks like a
one-off right now, it will go away and be there uniformly for all
distros.

llama_stack/templates/together/together.py

@@ -38,6 +38,7 @@ def get_distribution_template() -> DistributionTemplate:
             "inline::code-interpreter",
             "inline::rag-runtime",
             "remote::model-context-protocol",
+            "remote::wolfram-alpha",
         ],
     }
     name = "together"
@@ -73,6 +74,10 @@ def get_distribution_template() -> DistributionTemplate:
             toolgroup_id="builtin::code_interpreter",
             provider_id="code-interpreter",
         ),
+        ToolGroupInput(
+            toolgroup_id="builtin::wolfram_alpha",
+            provider_id="wolfram-alpha",
+        ),
     ]
     embedding_model = ModelInput(
         model_id="all-MiniLM-L6-v2",