Support for HelmRelease v2beta2 (flux 2.2.0)

[foot]

In Flux 2.2.0 .status.lastReleaseRevision will be deprecated and no longer populated.

The code in weave-gitops should be adapted as in flux:

• https://github.com/fluxcd/flux2/commit/afcf12194d786d2c3705ec80a4614cfd7acbfaea
• https://github.com/fluxcd/flux2/commit/2b653f9cfa8a3e25c59447f1aeac0066e9d9ed63

Anticipated behaviour:

• weave-gitops 0.38.0 + flux 2.1.0 -- inventory of helmrelease shown correctly
• weave-gitops 0.38.0 + flux 2.2.0 -- inventory not show or an error about not being able to read secret
• weave-gitops 0.3x.x (upcoming release) + flux 2.1.0 -- inventory of helmrelease shown correctly
• weave-gitops 0.3x.x (upcoming release) + flux 2.2.0 -- inventory of helmrelease shown correctly

[bigkevmcd]

We need to figure out what fields we use, and where they've gone.

We also want to continue to support the existing version, and the new(er) versions, we want to avoid another version break.

[stefanprodan]

To support both versions, WG can look at the CRD version (this is already fetched in the Flux controllers page), based on the API version the query logic should use:

• status.LastReleaseRevision v2beta1 / status.History.Latest().Version v2beta2
• status.LastAppliedRevision v2beta1 / status.History.Latest().ChartVersion v2beta2

[hiddeco]

The deprecation notices in the v2beta2 API should actually tell you where to look for values, as will they correctly indicate fields have been deprecated in the more intelligent IDEs.