lockable resource with CasC configuration - reloading issue - cannot get rid of declared resources

### Jenkins and plugins versions report

Environment

```Jenkins: 2.444
OS: Linux - 6.8.0-45-generic
Java: 17.0.10 - Eclipse Adoptium (OpenJDK 64-Bit Server VM)
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```

### What Operating System are you using (both controller, and any agents involved in the problem)?

Rocky8

### Reproduction steps

1. Create configuration with Casc, reload
```
unclassified:
lockableResourcesManager:
declaredResources:
- name: "foo"
- name: "bar"
- name: "waldo"
```
2. Check things looking fine
3. Create another configuration with Casc, reload:
```
unclassified:
lockableResourcesManager:
declaredResources:
```

### Expected Results

I expect the declared resources are all removed

### Actual Results

The declared resources are still there. I tried different things, like completely not loading in any "lockableResourcesManager", or like loading the below without delcaredResources:

```
unclassified:
lockableResourcesManager:
```
it does not work

However, trimming down the list works:
```
unclassified:
lockableResourcesManager:
declaredResources:
- name: "foo"
- name: "bar"
```
This will successfully remove Waldo.

### Anything else?

_No response_

### Are you interested in contributing a fix?

_No response_

Start with the lockableResourcesManager CasC configuration path and reproduce the two reloads described in the issue. Compare the behavior of an empty declaredResources value with a shortened list, then verify that reloading the empty configuration removes all previously declared resources.

Written by the indexing model from the issue text.