Inconsistent behavior with project properties in notifications

### Current Behavior

We are trying to use project properties with webhook notifications.

For some notifications (like `POLICY_VIOLATION`), `subject.project.properties` is populated as expected. But for other notifications (like `NEW_VULNERABLE_DEPENDENCY`), `subject.project.properties` is empty (no null).
Same thing when using `subject.component.project.properties` instead of `subject.project.properties`.

Is this the expected behavior? Or maybe there is a better or more consistent way to get project properties in notification templates?

### Steps to Reproduce

1.Add a new webhook notification with this template:
```
{
"notification": {
"level": "{{ notification.level | escape(strategy="json") }}",
"scope": "{{ notification.scope | escape(strategy="json") }}",
"group": "{{ notification.group | escape(strategy="json") }}",
"timestamp": "{{ notification.timestamp }}",
"title": "{{ notification.title | escape(strategy="json") }}",
"content": "{{ notification.content | escape(strategy="json") }}"
},

"subject.component.project.properties.toString" : "{{ subject.component.project.properties.toString | escape(strategy="json") }}",
"subject.component.project.properties": [
{% for p in subject.component.project.properties %}
{
"groupName": "{{ p.groupName.toString | escape(strategy="json") }}",
"propertyName": "{{ p.propertyName.toString | escape(strategy="json") }}",
"propertyValue": "{{ p.propertyValue.toString | escape(strategy="json") }}"
}
{% endfor %}
],

"subject.project.properties.toString" : "{{ subject.project.properties.toString | escape(strategy="json") }}",
"subject.project.properties": [
{% for p in subject.project.properties %}
{
"groupName": "{{ p.groupName.toString | escape(strategy="json") }}",
"propertyName": "{{ p.propertyName.toString | escape(strategy="json") }}",
"propertyValue": "{{ p.propertyValue.toString | escape(strategy="json") }}"
}
{% endfor %}
]
}
```

2. trigger POLICY_VIOLATION and NEW_VULNERABLE_DEPENDENCY notifications using this template
3. inspect the result JSON sent to the webhook URL

Results for a `POLICY_VIOLATION` notification:
```json
{
"notification": {
"level": "INFORMATIONAL",
"scope": "PORTFOLIO",
"group": "POLICY_VIOLATION",
"timestamp": "2024-11-07T14:42:22.965782190",
"title": "Policy Violation on Project: [test lme : 1.0]",
"content": "A security policy violation occurred"
},
"subject.component.project.properties.toString": "[org.dependencytrack.model.ProjectProperty@7872efd6]",
"subject.component.project.properties": [
{
"groupName": "my_group",
"propertyName": "my_property",
"propertyValue": "my_value"
}
],
"subject.project.properties.toString": "[org.dependencytrack.model.ProjectProperty@7872efd6]",
"subject.project.properties": [
{
"groupName": "my_group",
"propertyName": "my_property",
"propertyValue": "my_value"
}
]
}
```

Results for a `NEW_VULNERABLE_DEPENDENCY` notification (no properties in the result):
```json
{
"notification": {
"level": "INFORMATIONAL",
"scope": "PORTFOLIO",
"group": "NEW_VULNERABLE_DEPENDENCY",
"timestamp": "2024-11-07T14:42:22.961691586",
"title": "Vulnerable Dependency Introduced on Project: [test lme : 1.0]",
"content": "A dependency was introduced that contains 11 known vulnerabilities"
},
"subject.component.project.properties.toString": "",
"subject.component.project.properties": [

],
"subject.project.properties.toString": "",
"subject.project.properties": [

]
}
```

### Expected Behavior

The ability to have access to project properties consistently for all notification types.

### Dependency-Track Version

4.12.0

### Dependency-Track Distribution

Container Image

### Database Server

PostgreSQL

### Database Server Version

12

### Browser

Google Chrome

### Checklist

- [x] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#filing-issues)
- [x] I have checked the [existing issues](https://github.com/DependencyTrack/dependency-track/issues) for whether this defect was already reported