[Issue-9889] [integration tests] Refactored Function integration tests

[david-streamlio]

Fixes #9889

Motivation

Restructure the function integration tests for easier maintainability going forward

Modifications

I have broken out the existing test cases into separate classes based upon the type of Function we are trying to test, e.g Go, Java, Python, etc. Previously all of these tests were in a single class which violates OOP principles significantly

Verifying this change

This change is already covered by existing tests, such as (please describe tests).

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (No)
• The public API: (No)
• The schema: (No)
• The default values of configurations: (No)
• The wire protocol: (No)
• The rest endpoints: (No)
• The admin cli options: (No)
• Anything that affects deployment: (No)

Documentation

• Does this pull request introduce a new feature? (No)
• If yes, how is the feature documented? (not applicable)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[david-streamlio]

/pulsarbot run-failure-checks

[david-streamlio]

/pulsarbot run-failure-checks

[aahmed-se]

Add description for changes.

[eolivelli]

Looks good to me.
Awesome work!

@lhotari do you want to take a look?
I am not sure if there is some overlapping with your work.

BTW we can merge one of the two patches and then rebase the other one.

[eolivelli]

@david-streamlio can you fix the conflicts please?

[sijie]

@freeznet Can you review this pull request?

[jerrypeng]

/pulsarbot run-failure-checks

[david-streamlio]

/pulsarbot run-failure-checks