Update pr_time_benchmarks log classification rule (#6615)

### Testing

https://hud.pytorch.org/pr/151317

Author: huydhn

aws/lambda/log-classifier/fixtures/request.json

@@ -2,7 +2,7 @@
   "version": "2.0",
   "routeKey": "$default",
   "rawPath": "/",
-  "rawQueryString": "job_id=30729919115&repo=pytorch%2Fpytorch",
+  "rawQueryString": "job_id=41953007954&repo=pytorch%2Fpytorch",
   "headers": {
     "accept": "*/*",
     "content-length": "0",

aws/lambda/log-classifier/ruleset.toml

@@ -218,7 +218,7 @@ pattern = '^\s*(test.*) errored - num_retries_left:'
 
 [[rule]]
 name = 'pr_time_benchmarks regression'
-pattern = '^REGRESSION: benchmark.*'
+pattern = '^(REGRESSION|MISSING REGRESSION TEST): benchmark.*'
 
 [[rule]]
 name = 'Python RuntimeError'
@@ -311,4 +311,4 @@ pattern = '^##\[error\](.*)'
 
 [[rule]]
 name = 'New modules are not documented correctly'
-pattern = 'You added the following module\(s\) to the PyTorch namespace .* but they'
+pattern = 'You added the following module\(s\) to the PyTorch namespace .* but they'