feat: consolidate most distros into "starter" (#2516)

# What does this PR do?

* Removes a bunch of distros
* Removed distros were added into the "starter" distribution
* Doc for "starter" has been added
* Partially reverts https://github.com/meta-llama/llama-stack/pull/2482
  since inference providers are disabled by default and can be turned on
  manually via env variable.
* Disables safety in starter distro

Closes: https://github.com/meta-llama/llama-stack/issues/2502.

~Needs: https://github.com/meta-llama/llama-stack/pull/2482 for Ollama
to work properly in the CI.~

TODO:

- [ ] We can only update `install.sh` when we get a new release.
- [x] Update providers documentation
- [ ] Update notebooks to reference starter instead of ollama

Signed-off-by: Sébastien Han <seb@redhat.com>

tests/integration/fixtures/common.py

@@ -10,6 +10,7 @@ import socket
 import subprocess
 import tempfile
 import time
+from urllib.parse import urlparse
 
 import pytest
 import requests
@@ -215,12 +216,17 @@ def llama_stack_client(request, provider_data):
             provider_data=provider_data,
         )
 
-    # check if this looks like a URL
-    if config.startswith("http") or "//" in config:
-        return LlamaStackClient(
-            base_url=config,
-            provider_data=provider_data,
-        )
+    # check if this looks like a URL using proper URL parsing
+    try:
+        parsed_url = urlparse(config)
+        if parsed_url.scheme and parsed_url.netloc:
+            return LlamaStackClient(
+                base_url=config,
+                provider_data=provider_data,
+            )
+    except Exception:
+        # If URL parsing fails, treat as non-URL config
+        pass
 
     if "=" in config:
         run_config = run_config_from_adhoc_config_spec(config)