Remove deprecated with

packages/@ember/-internals/glimmer/index.ts

@@ -88,34 +88,6 @@
  @public
  */
 
-/**
-  Use the `{{with}}` helper when you want to alias a property to a new name. This is helpful
-  for semantic clarity as it allows you to retain default scope or to reference a property from another
-  `{{with}}` block.
-
-  If the aliased property is "falsey", for example: `false`, `undefined` `null`, `""`, `0`, `NaN` or
-  an empty array, the block will not be rendered.
-
-  ```app/templates/application.hbs
-  {{! Will only render if user.posts contains items}}
-  {{#with @model.posts as |blogPosts|}}
-    <div class="notice">
-      There are {{blogPosts.length}} blog posts written by {{@model.name}}.
-    </div>
-    {{#each blogPosts as |post|}}
-      <li>{{post.title}}</li>
-    {{/each}}
-  {{/with}}
-  ```
-
-  @method with
-  @for Ember.Templates.helpers
-  @param {Object} options
-  @return {String} HTML string
-  @deprecated Use '{{#let}}' instead
-  @public
- */
-
 /**
   `{{yield}}` denotes an area of a template that will be rendered inside
   of another template.

packages/@ember/-internals/glimmer/tests/integration/helpers/partial-test.js

@@ -352,38 +352,6 @@ moduleFor(
       this.assertText('number: EVEN0number: ODD1number: EVEN2number: ODD3');
     }
 
-    ['@test [DEPRECATED] dynamic partials in {{#with}}']() {
-      this.registerPartial('_thing', '{{t}}');
-
-      expectDeprecation(() => {
-        this.render(
-          strip`
-        {{#with this.item.thing as |t|}}
-          {{partial t}}
-        {{else}}
-          Nothing!
-        {{/with}}`,
-          {
-            item: { thing: false },
-          }
-        );
-      }, /`{{#with}}` is deprecated\./);
-
-      this.assertStableRerender();
-
-      this.assertText('Nothing!');
-
-      expectDeprecation(() => {
-        runTask(() => set(this.context, 'item.thing', 'thing'));
-      }, 'The use of `{{partial}}` is deprecated, please refactor the "thing" partial to a component');
-
-      this.assertText('thing');
-
-      runTask(() => set(this.context, 'item', { thing: false }));
-
-      this.assertText('Nothing!');
-    }
-
     ['@test dynamic partials in {{#let}}']() {
       this.registerPartial('_thing', '{{t}}');