[flux2] Allow skipping pre-install checks

[alvarocabanas]

Is your feature request related to a problem ?

We want to support versions of k8s prior to the ones set on flux-check, right now installation fails if the k8s version is lower than 1.30.0.
We know Flux doesn't recommend running EOL versions in production, even if Flux works on them, but it's a recommendation and we think it should be allowed to be skipped by the user of the chart.

Describe the solution you'd like.

Having a value -true by default- setting or unsetting preInstallHooks.

Describe alternatives you've considered.

Creating our own cli image that allows previous k8s versions and modifying our values file to point to it.

Additional context.

No response

[stefanprodan]

You can run helm install and upgrade with the --no-hooks flag.

[paologallinaharbur]

Hello! The issue is that --no-hooks is preventing all hooks from running.
The issue is that we are including flux2 as a dependency in a chart that has different hooks that we still want to execute!
Moreover, this approach could break whenever a new hook is introduced 😕