Add MatButtonModule to SideNavModule.

PiperOrigin-RevId: 824528367

Author: muditgokhale2

frontend/app/components/sidenav/BUILD

@@ -18,6 +18,7 @@ xprof_ng_module(
         "@npm//@angular/router",
         "@npm//@ngrx/store",
         "@npm//rxjs",
+        "@org_xprof//frontend/app/common/angular:angular_material_button",
         "@org_xprof//frontend/app/common/angular:angular_material_core",
         "@org_xprof//frontend/app/common/angular:angular_material_form_field",
         "@org_xprof//frontend/app/common/angular:angular_material_select",

frontend/app/components/sidenav/sidenav_module.ts

@@ -1,5 +1,6 @@
 import {CommonModule} from '@angular/common';
 import {NgModule} from '@angular/core';
+import {MatButtonModule} from '@angular/material/button';
 import {MatOptionModule} from '@angular/material/core';
 import {MatFormFieldModule} from '@angular/material/form-field';
 import {MatSelectModule} from '@angular/material/select';
@@ -15,6 +16,7 @@ import {SideNav} from './sidenav';
   declarations: [SideNav],
   imports: [
     CommonModule,
+    MatButtonModule,
     MatFormFieldModule,
     MatSelectModule,
     MatOptionModule,