Don't suggest that users delete CRDs when upgrading

[nightkr]

See https://stackable-workspace.slack.com/archives/C031BTE7ZGC/p1683797224359929

Cherry-pick of #405

[sbernauer]

Thanks!

[nightkr]

@fhennig did anything change lately regarding the Antora build? I don't think I touched any of the failing stuff...

[nightkr]

So this is causing existing objects to become impossible to modify after the upgrade is complete. This is because the new field status.conditions is mandatory, but doesn't have a default value. This would have to be fixed in each operator, by adding a default. For example, in nifi-operator:

diff --git a/rust/crd/src/lib.rs b/rust/crd/src/lib.rs
index 402f8bc..0b8e6b7 100644
--- a/rust/crd/src/lib.rs
+++ b/rust/crd/src/lib.rs
@@ -205,6 +205,7 @@ pub enum NifiRole {
 #[derive(Clone, Debug, Default, Deserialize, JsonSchema, Serialize)]
 pub struct NifiStatus {
     pub deployed_version: Option<String>,
+    #[serde(default)]
     pub conditions: Vec<ClusterCondition>,
 }

[nightkr]

Ok, this has now been updated from #405.