[AAP-38819] - Setting up pytest + S3 (Minio) + example test

[himdel]

Issue: AAP-38819
Closes #57

I was testing #57 after #52 by adding postgres to the mix,
and managed to get it working (I think :))

cc @msmagnanijr
This is your #57 rebased on top of current devel,, with a commit adding postgres, switching to quay repositories, and working around permission issues with uv.

gather_automation_controller_billing_data runs successfully now :)

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What is being changed?

• Minio setup for local and CI testing.
• Addition of an initial test scenario to validate CCSPv2 report generation with S3 backend.
• Integration with pytest to run automated tests using Minio as a simulated backend.

Why is this change needed?

• Enables testing of metrics-utility S3 storage functionality without relying on an external environment.
• Facilitates test automation in the CI pipeline.
• Ensures that report generation works correctly with the S3 backend before full implementation.

How does this change address the issue?

• Uses Minio as a local S3 backend for testing.
• Defines the necessary setup to run locally and in CI.
• Implements an initial test case covering CCSPv2 report generation.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.9% Duplication on New Code

See analysis details on SonarQube Cloud

[Ladas]

Awesome. 👍

[himdel]

Merging to get #72 unblocked,
will follow up by moving the s3 test alongside the existing pytest tests