Fix: Model provider add verify and fixed form in modal not resetting issue (#15520)

### What problem does this PR solve?

Fix: Model provider add verify and fixed form in modal not resetting
issue

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/services/llm-service.ts

@@ -7,6 +7,7 @@ const {
   listProviders,
   addProvider,
   addProviderInstance,
+  verifyProviderConnection,
   listProviderInstances,
   listInstanceModels,
   showProviderInstance,
@@ -40,6 +41,10 @@ const methods = {
     url: addProviderInstance,
     method: 'post',
   },
+  verifyProviderConnection: {
+    url: verifyProviderConnection,
+    method: 'post',
+  },
   listProviderInstances: {
     url: listProviderInstances,
     method: 'get',