Vault Provider does not support ManagementPolicies anymore

[Rbillon59]

What happened?

I'am using Crossplane v1.16, using the Beta feature ManagementPolicies

Vault Provider still considers the ManagementPolicies as Alpha and require to explicitly enable it on the ControllerConfig

So when trying to use managementPolicies on a Vault resource, it fails with

message: >-
        `spec.managementPolicies` is set to a non-default value but the feature
        is not enabled: [Observe]

But if I try to explicitly enable the former alpha feature with --enable-management-policies I get

crossplane: error: unknown flag --enable-management-policies

How can we reproduce it?

1. Deploy Crossplane 1.16 with a vault provider configured (1.0.0)
2. Create a Vault Managed Resource with the ManagementPolicy : ["Observe"]

What environment did it happen in?

Crossplane : 1.16
Vault Provider : 1.0.0