Merge roles and districts and allow multiple district assigning (#1124)

* [rebase] Display default values to assign roles and districts on user select

* [rebase] Allow saving of both user role and districts at the same time and refresh role displayed

* Make edits for many to many relationship change for districts and users

* Remove zone select for read only

src/api/user.js

@@ -40,10 +40,10 @@ export const assignDistrict = async (userId, districtId) => {
   )
 }
 
-export const assignDistricts = async (userId, districtIds) => {
+export const assignDistricts = async (userId, districts) => {
   return axios.post(
     API.ASSIGN_DISTRICTS(userId),
-    { districtIds: districtIds },
+    { districts: districts },
     getAuthHeaderConfig(),
   )
 }