feat: update qdrant hash function from SHA-1 to SHA-256 (llamastack#3477)

# What does this PR do?
Updates the qdrant provider's convert_id function to use a
FIPS-validated cryptographic hashing function, so that llama-stack is
considered to be `Designed for FIPS`.

The standard library `uuid.uuid5()` function uses SHA-1 under the hood,
which is not FIPS-validated. This commit uses an approach similar to the
one merged in llamastack#3423.

Closes llamastack#3476.

## Test Plan
Unit tests from scripts/unit-tests.sh were ran to verify that the tests
pass.

A small test script can display the data flow:
```python
import hashlib
import uuid

# Input
_id = "chunk_abc123"
print(_id)

# Step 1: Format and encode
hash_input = f"qdrant_id:{_id}".encode()
print(hash_input)
# Result: b'qdrant_id:chunk_abc123'

# Step 2: SHA-256 hash
sha256_hash = hashlib.sha256(hash_input).hexdigest()
print(sha256_hash)
# Result: "184893a6eafeaac487cb9166351e8625b994d50f3456d8bc6cea32a014a27151"

# Step 3: Create UUID from first 32 chars
uuid_string = str(uuid.UUID(sha256_hash[:32]))
print(uuid_string)
# sha256_hash[:32] = "184893a6eafeaac487cb9166351e8625"
# Final result: "184893a6-eafe-aac4-87cb-9166351e8625"
```

Signed-off-by: Doug Edgar <[email protected]>

Author: rhdedgar

llama_stack/providers/remote/vector_io/qdrant/qdrant.py

@@ -5,6 +5,7 @@
 # the root directory of this source tree.
 
 import asyncio
+import hashlib
 import uuid
 from typing import Any
 
@@ -49,10 +50,13 @@ def convert_id(_id: str) -> str:
     Converts any string into a UUID string based on a seed.
 
     Qdrant accepts UUID strings and unsigned integers as point ID.
-    We use a seed to convert each string into a UUID string deterministically.
+    We use a SHA-256 hash to convert each string into a UUID string deterministically.
     This allows us to overwrite the same point with the original ID.
     """
-    return str(uuid.uuid5(uuid.NAMESPACE_DNS, _id))
+    hash_input = f"qdrant_id:{_id}".encode()
+    sha256_hash = hashlib.sha256(hash_input).hexdigest()
+    # Use the first 32 characters to create a valid UUID
+    return str(uuid.UUID(sha256_hash[:32]))
 
 
 class QdrantIndex(EmbeddingIndex):