revert : Added displayUsername and username update functionality

removes implemenation from #35699
This reverts commit e154f38118.

client/src/client-only-routes/ShowSettings.js

@@ -48,7 +48,6 @@ const propTypes = {
         files: PropTypes.array
       })
     ),
-    displayUsername: PropTypes.string,
     email: PropTypes.string,
     githubProfile: PropTypes.string,
     is2018DataVisCert: PropTypes.bool,
@@ -122,7 +121,6 @@ export function ShowSettings(props) {
     toggleNightMode,
     user: {
       completedChallenges,
-      displayUsername,
       email,
       is2018DataVisCert,
       isApisMicroservicesCert,
@@ -193,12 +191,9 @@ export function ShowSettings(props) {
             </Button>
           </FullWidthRow>
           <Spacer />
-          <h1
-            className='text-center'
-            style={{ overflowWrap: 'break-word' }}
-          >{`Account Settings for ${
-            displayUsername ? displayUsername : username
-          }`}</h1>
+          <h1 className='text-center' style={{ overflowWrap: 'break-word' }}>
+            {`Account Settings for ${username}`}
+          </h1>
           <About
             about={about}
             currentTheme={theme}
@@ -208,7 +203,7 @@ export function ShowSettings(props) {
             points={points}
             submitNewAbout={submitNewAbout}
             toggleNightMode={toggleNightMode}
-            username={displayUsername ? displayUsername : username}
+            username={username}
           />
           <Spacer />
           <Privacy />