[BLD] Speed up embeddings test (#2126)

`chromadb/test/property/test_embeddings.py`: ~40m -> ~20m (would likely
continue to benefit from additional cores)

Hoping to continue enabling test parallelization on a test file basis
(with the end goal of all tests being parallelized).

---------

Co-authored-by: hammadb <[email protected]>

Author: codetheweb

.github/workflows/_python-tests.yml

@@ -25,6 +25,10 @@ jobs:
                    "chromadb/test/property/test_embeddings.py",
                    "chromadb/test/property/test_filtering.py",
                    "chromadb/test/property/test_persist.py"]
+        include:
+          - test-globs: "chromadb/test/property/test_embeddings.py"
+            parallelized: true
+
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
@@ -33,7 +37,7 @@ jobs:
         with:
           python-version: ${{ matrix.python }}
       - name: Test
-        run: python -m pytest ${{ matrix.test-globs }}
+        run: python -m pytest ${{ matrix.parallelized && '-n auto' || '' }}  ${{ matrix.test-globs }}
         shell: bash
 
   # todo: break out stress integration tests

requirements_dev.txt

@@ -8,6 +8,7 @@ mypy-protobuf
 pre-commit
 pytest
 pytest-asyncio
+pytest-xdist
 setuptools_scm
 types-protobuf
 types-requests==2.30.0.0