[chore] rewrite python tests into golang and remove python tests

[pszkamruk-splunk]

Description: This PR contains changes related to removing the Python dependency from the project. Python was previously used for Splunk integration tests, which have now been rewritten in Golang.

Changes:

1. Rewriting existing Python tests in Golang.
2. Removing Python-related test files and unnecessary configuration files.
3. Updating the pipeline to run Golang Splunk integration tests.
4. Improving test verifications.
5. Adding missing tests to fully test the pod annotations feature (the setup.yaml file contains configurations that were not fully tested).

Next steps:

1. Integrate Golang Splunk integration tests with existing functional tests

• use testcontainers-go to spin Splunk
• setup environment via deployEnv function
• integration with existing functional test matrix

PS. Current pipeline which runs minikube with different container runtimes for docker will be removed this will reduce the number of jobs to run. Also number of tested Splunk versions will be reduced to the latest one.

[jvoravong]

LGTM. I can think of some improvements to add later, but this work gets us closer to our end goals.