Update flux 2.3.0

[kvaps]

Description of the change

This PR enables new flux 2.3.0 support in dashboard

Benefits

FluxCD released new version with stabilized APIs

Possible drawbacks

Caravel plugin currently can't be builded due to dependencies problem of caravel and new kubernetes library

Applicable issues

• fixes #

Additional information

This is more likely draft PR for kubeapps developers, to help them with fluxcd updating in the next release. We have solved this issue in Cozystack project and I just wanted to share the patch

Sorry, right now I have no oportunity to invest my time for properly fix all the issues and align all the failing tests.

downstream issue:

• https://github.com/aenix-io/cozystack/pull/171

cc @absoludity @antgamdia

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[absoludity]

Hi @kvaps . @ppbaena is probably the best person to speak with about getting things merged here. I'm no longer working for VMware.