Change leaf value of used_cnt of sonic-events-swss:chk_crm_threshold (#17430)

### Why I did it

Current YANG model of sonic-events-swss:chk_crm_threshold has the type uint8 for leaf used_cnt which is too small of a range to hold values of used_cnt which can greatly exceed that. Updating leaf type of used_cnt and free_cnt to match defined definition.

Changed to uint32 as per defined here: https://github.com/sonic-net/sonic-swss/blob/master/orchagent/crmorch.h#L99

##### Work item tracking
- Microsoft ADO **(number only)**:26091912

#### How I did it

Update leaf value

#### How to verify it

UT and sonic-mgmt PR checker

Author: zbud-msft

src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-events-swss.json

@@ -180,9 +180,9 @@
     "SONIC_EVENTS_SWSS_CHK_CRM_THRESHOLD_VALID": {
         "sonic-events-swss:sonic-events-swss": {
             "sonic-events-swss:chk_crm_threshold": {
-                "percent": 0,
-                "used_cnt": 0,
-                "free_cnt": 0,
+                "percent": 80,
+                "used_cnt": 6414,
+                "free_cnt": 65300,
                 "timestamp": "1985-04-12T23:20:50.52Z"
             }
         }

src/sonic-yang-models/yang-models/sonic-events-swss.yang

@@ -102,11 +102,11 @@ module sonic-events-swss {
             }
 
             leaf used_cnt {
-                type uint8;
+                type uint32;
             }
 
             leaf free_cnt {
-                type uint64;
+                type uint32;
             }
 
             uses evtcmn:sonic-events-cmn;