Refactoring proxy lifetime to only shutdown when proxy is out-of-date. (#839)

## Summary of the Pull Request

_What is this about?_
We'd like to refactor the proxy lifecycle to only delete when the proxy is out-of-date - i.e. when the proxy is older than 7 days or a mismatched version. I've changed two files, proxy.py and timer_daily\init.py to check for the version and timestamp before stopping a live proxy. 

## PR Checklist
* [ ] Applies to work item: #xxx
* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/onefuzz) and sign the CLI.
* [ ] Tests added/passed
* [ ] Requires documentation to be updated
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

## Info on Pull Request

_What does this include?_
Changes to two files: 
proxy.py: 
- get_or_create() edited to check if timestamp is >7 days.
- Created is_outdated() to check version and timestamp for out-of-date proxy. 
timer_daily/init.py
- Proxy check now includes is_outdated() before determining if a proxy should be shutdown. 

## Validation Steps Performed
Deploying test instance to determine if proxy lives past a single day.

src/pytypes/extra/generate-docs.py

@@ -156,10 +156,11 @@ def main() -> None:
             state=TaskState.init,
             config=task_config,
         ),
-        EventProxyCreated(region=Region("eastus")),
-        EventProxyDeleted(region=Region("eastus")),
+        EventProxyCreated(region=Region("eastus"), proxy_id=UUID(int=0)),
+        EventProxyDeleted(region=Region("eastus"), proxy_id=UUID(int=0)),
         EventProxyFailed(
             region=Region("eastus"),
+            proxy_id=UUID(int=0),
             error=Error(code=ErrorCode.PROXY_FAILED, errors=["example error message"]),
         ),
         EventPoolCreated(
@@ -272,7 +273,6 @@ def main() -> None:
     )
 
     result = ""
-
     result += layer(
         1,
         "Webhook Events",

src/pytypes/onefuzztypes/events.py

@@ -121,14 +121,17 @@ class EventPoolCreated(BaseEvent):
 
 class EventProxyCreated(BaseEvent):
     region: Region
+    proxy_id: Optional[UUID]
 
 
 class EventProxyDeleted(BaseEvent):
     region: Region
+    proxy_id: Optional[UUID]
 
 
 class EventProxyFailed(BaseEvent):
     region: Region
+    proxy_id: Optional[UUID]
     error: Error
 
 

src/pytypes/onefuzztypes/models.py

@@ -432,6 +432,7 @@ class ProxyConfig(BaseModel):
     url: str
     notification: str
     region: Region
+    proxy_id: UUID
     forwards: List[Forward]
     instance_telemetry_key: Optional[str]
     microsoft_telemetry_key: Optional[str]
@@ -440,6 +441,7 @@ class ProxyConfig(BaseModel):
 
 class ProxyHeartbeat(BaseModel):
     region: Region
+    proxy_id: UUID
     forwards: List[Forward]
     timestamp: datetime = Field(default_factory=datetime.utcnow)