chore: Enabling Integration tests for Weaviate (#2882)

# What does this PR do?

This PR (1) enables the files API for Weaviate and (2) enables
integration tests for Weaviate, which adds a docker container to the
github action.

This PR also handles a couple of edge cases for in creating the
collection and ensuring the tests all pass.

## Test Plan
CI enabled

---------

Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>

llama_stack/providers/utils/vector_io/vector_utils.py

@@ -5,6 +5,7 @@
 # the root directory of this source tree.
 
 import hashlib
+import re
 import uuid
 
 
@@ -19,3 +20,20 @@ def generate_chunk_id(document_id: str, chunk_text: str, chunk_window: str | Non
     if chunk_window:
         hash_input += f":{chunk_window}".encode()
     return str(uuid.UUID(hashlib.md5(hash_input, usedforsecurity=False).hexdigest()))
+
+
+def proper_case(s: str) -> str:
+    """Convert a string to proper case (first letter uppercase, rest lowercase)."""
+    return s[0].upper() + s[1:].lower() if s else s
+
+
+def sanitize_collection_name(name: str, weaviate_format=False) -> str:
+    """
+    Sanitize collection name to ensure it only contains numbers, letters, and underscores.
+    Any other characters are replaced with underscores.
+    """
+    if not weaviate_format:
+        s = re.sub(r"[^a-zA-Z0-9_]", "_", name)
+    else:
+        s = proper_case(re.sub(r"[^a-zA-Z0-9]", "", name))
+    return s