Python: skip redis tests in CI if the platform is not linux (#2727)

### Motivation and Context
The python integration tests use the public redis docker image. This
image is not available to our macOS and windows test agents. This PR
ensures that the tests are skipped on non-linux platforms (CI only).

### Description

<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [ ] The code builds clean without any errors or warnings
- [ ] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [ ] All unit tests pass, and I have added new tests where possible
- [ ] I didn't break anyone 😄

.github/workflows/python-integration-tests.yml

@@ -91,7 +91,10 @@ jobs:
           AZURE_COGNITIVE_SEARCH_ADMIN_KEY: ${{secrets.AZURE_COGNITIVE_SEARCH_ADMIN_KEY}}
           AZURE_COGNITIVE_SEARCH_ENDPOINT: ${{secrets.AZURE_COGNITIVE_SEARCH_ENDPOINT}}
         run: |
-          docker run -d --name redis-stack-server -p 6379:6379 redis/redis-stack-server:latest
+          if ${{ matrix.os == 'ubuntu-latest' }}; then
+            docker run -d --name redis-stack-server -p 6379:6379 redis/redis-stack-server:latest
+          fi
+
           cd python
           poetry run pytest ./tests/integration -v
 
@@ -150,7 +153,10 @@ jobs:
           AZURE_COGNITIVE_SEARCH_ADMIN_KEY: ${{secrets.AZURE_COGNITIVE_SEARCH_ADMIN_KEY}}
           AZURE_COGNITIVE_SEARCH_ENDPOINT: ${{secrets.AZURE_COGNITIVE_SEARCH_ENDPOINT}}
         run: |
-          docker run -d --name redis-stack-server -p 6379:6379 redis/redis-stack-server:latest
+          if ${{ matrix.os == 'ubuntu-latest' }}; then
+            docker run -d --name redis-stack-server -p 6379:6379 redis/redis-stack-server:latest
+          fi
+
           cd python
           poetry run pytest ./tests/integration -v
 

python/tests/integration/connectors/memory/test_redis.py

@@ -1,6 +1,8 @@
 # Copyright (c) Microsoft. All rights reserved.
 
 import asyncio
+import os
+import platform
 from datetime import datetime
 
 import numpy as np
@@ -21,6 +23,11 @@ except ImportError:
 
 pytestmark = pytest.mark.skipif(not redis_installed, reason="Redis is not installed")
 
+pytestmark = pytest.mark.skipif(
+    platform.system() != "Linux" and "Python_Integration_Tests" in os.environ,
+    reason="local redis docker container is not available on all non-Linux platforms",
+)
+
 
 @pytest.fixture(scope="session")
 def connection_string():