Migrate Redis tests to Testcontainers

[Alirexaa]

What this PR does / why we need it:
This pull request includes several changes to integrate Testcontainers for Redis in the health checks testing suite. The most important changes include adding a new fixture for Redis containers, updating test cases to use the fixture, and modifying configuration files to include the new dependencies.

Integration of Testcontainers for Redis:

• test/HealthChecks.Redis.Tests/RedisContainerFixture.cs: Added a new fixture class RedisContainerFixture to manage the lifecycle of a Redis container using Testcontainers.
• test/HealthChecks.Redis.Tests/RedisContainerImageTags.cs: Added a static class RedisContainerImageTags to define constants for the Redis container image tags.

Updates to test cases:

• test/HealthChecks.Redis.Tests/Functional/RedisHealthCheckTests.cs: Modified test cases to use the RedisContainerFixture for obtaining the Redis connection string instead of hardcoding it. [1] [2] [3] [4]

Configuration changes:

• .github/workflows/healthchecks_redis_ci.yml: Removed the Redis service configuration from the CI workflow.
• Directory.Packages.props: Added the Testcontainers.Redis package version.
• build/versions.props: Defined the TestcontainersVersion property.
• test/HealthChecks.Redis.Tests/HealthChecks.Redis.Tests.csproj: Added a package reference for Testcontainers.Redis.

Which issue(s) this PR fixes:

Contributes to #2335

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Unit tests passing
• End-to-end tests passing
• Extended the documentation
• Provided sample for the feature

[adamsitnik]

It looks VERY clean and simple, great work @Alirexaa !

Which OS have you used it to test it locally?
What is needed to run it on Windows? WSL 2?

Do you think that testing other health checks that don't have a dedicated Testcontainers package (like Testcontainers.Redis here) is also going to be that simple?

[Alirexaa]

Which OS have you used it to test it locally? What is needed to run it on Windows? WSL 2?

Windows 10 with docker desktop. WSL 2 is necessary.

The tests must be run on a machine with Docker already installed.

Do you think that testing other health checks that don't have a dedicated Testcontainers package (like Testcontainers.Redis here) is also going to be that simple?

Most of them yes. Some of them may need more work to do.

@adamsitnik, There are some examples you can take a look at.
See:

https://github.com/dotnet/aspire/blob/39912824d33de54be24baf842bf9228a6a84ac33/tests/Aspire.Qdrant.Client.Tests/QdrantContainerFixture.cs

https://github.com/CommunityToolkit/Aspire/blob/f1abddb99ee3f966677b8e8c933f7842065e6b83/tests/CommunityToolkit.Aspire.Meilisearch.Tests/MeilisearchContainerFixture.cs

https://github.com/CommunityToolkit/Aspire/blob/f1abddb99ee3f966677b8e8c933f7842065e6b83/tests/CommunityToolkit.Aspire.OllamaSharp.Tests/OllamaContainerFeature.cs

https://github.com/CommunityToolkit/Aspire/blob/f1abddb99ee3f966677b8e8c933f7842065e6b83/tests/CommunityToolkit.Aspire.EventStore.Tests/EventStoreContainerFixture.cs

[adamsitnik]

LGTM, thank you very much @Alirexaa !