Merge https://github.com/google/adk-python/pull/3430
**Please ensure you have read the [contribution guide](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) before creating a pull request.**
### Link to Issue or Description of Change
**1. Link to an existing issue (if applicable):**
- Closes: #3429
**2. Or, if no issue exists, describe the change:**
_If applicable, please follow the issue templates to provide as much detail as
possible._
**Problem:**
The existing `/list-apps` endpoint only returns the name of the folder that each agent is in
**Solution:**
This adds a new endpoint `/list-apps-detailed` which will load each agent using the existing `AgentLoader.load_agent` method, and then return the folder name, display name (with underscores replaced with spaces for a more readable version), description, and the agent type.
This does introduce overhead if you had multiple agents since they all need to be loaded, but by maintaining the existing `/list-apps` endpoint, users can choose which one to hit if they don't want to load all agents. Since the existing `load_agents` method will cache results, there's only a penalty on the first hit.
### Testing Plan
Created a unit test for this, similar to the `/list-apps`. Also tested this with my own ADK instance to verify it loaded correctly.
```
curl --location "localhost:8000/list-apps-detailed"
```
```json
{
"apps": [
{
"name": "agent_1",
"displayName": "Agent 1",
"description": "A test description for a test agent",
"agentType": "package"
},
{
"name": "agent_2",
"displayName": "Agent 2",
"description": "A test description for a test agent ",
"agentType": "package"
},
{
"name": "agent_3",
"displayName": "Agent 3",
"description": "A test description for a test agent",
"agentType": "package"
}
]
}
```
**Unit Tests:**
- [X] I have added or updated unit tests for my change.
- [X] All unit tests pass locally.
3054 passed, 2383 warnings in 46.96s
### Checklist
- [X] I have read the [CONTRIBUTING.md](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) document.
- [X] I have performed a self-review of my own code.
- [X] I have commented my code, particularly in hard-to-understand areas.
- [X] I have added tests that prove my fix is effective or that my feature works.
- [X] New and existing unit tests pass locally with my changes.
- [X] I have manually tested my changes end-to-end.
- [X] Any dependent changes have been merged and published in downstream modules.
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3430 from dylan-apex:more-detailed-list-apps e6864fd61a673da5fd2fb28d2d7d72cb90f5af0a
PiperOrigin-RevId: 834907771
