chore: Search improvements (#10801)

- Adds pagination support for search.
- Use composition API on all search related component.
- Minor UI improvements.
- Adds missing specs

Loom video
https://www.loom.com/share/5b01afa5c9204e7d97ff81b215621dde?sid=82ca6d22-ca8c-4d5e-8740-ba06ca4051ba

app/javascript/dashboard/api/search.js

@@ -14,26 +14,29 @@ class SearchAPI extends ApiClient {
     });
   }
 
-  contacts({ q }) {
+  contacts({ q, page = 1 }) {
     return axios.get(`${this.url}/contacts`, {
       params: {
         q,
+        page: page,
       },
     });
   }
 
-  conversations({ q }) {
+  conversations({ q, page = 1 }) {
     return axios.get(`${this.url}/conversations`, {
       params: {
         q,
+        page: page,
       },
     });
   }
 
-  messages({ q }) {
+  messages({ q, page = 1 }) {
     return axios.get(`${this.url}/messages`, {
       params: {
         q,
+        page: page,
       },
     });
   }