🐛 Fix agent node affinity settings to always prefer control plane nodes

[Danil-Grigorev]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist:

• squashed commits into logical changes
• includes documentation
• adds unit tests
• adds or updates e2e tests

[richardcase]

I think we need to hold off on this change for the following reasons:

• We've not seen any issues in our testing specifically related to the scheduling/placement of the agent pod(s).
• We don't have time to thoroughly test the impact of this before the release
• We should consider fixing this upstream instead

[richardcase]

Lets split out the helm addon and changing the tests to use calico instead of kindnet from the other changes.

[furkatgofurov7]

@Danil-Grigorev let's break this PR into two, the one with the changes @richardcase suggested and the latter we can go through in more detail.

[Danil-Grigorev]

I’ll close this PR and open a separate one with calico changes only later.