Playwright upgrade and small addition to ChannelsPage helper (#22978)

* partial commit

* upgrade playwright to 1.32.3 (ui + project dependencies support)

* revert empty line

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/playwright/support/ui/components/channels/post_create.ts

@@ -9,6 +9,7 @@ export default class ChannelsPostCreate {
     readonly input;
     readonly attachmentButton;
     readonly emojiButton;
+    readonly sendButton: Locator;
 
     constructor(container: Locator) {
         this.container = container;
@@ -16,12 +17,17 @@ export default class ChannelsPostCreate {
         this.input = container.getByTestId('post_textbox');
         this.attachmentButton = container.getByLabel('attachment');
         this.emojiButton = container.getByLabel('select an emoji');
+        this.sendButton = container.getByTestId('SendMessageButton');
     }
 
     async postMessage(message: string) {
         await this.input.fill(message);
     }
 
+    async sendMessage() {
+        await this.sendButton.click();
+    }
+
     async toBeVisible() {
         await expect(this.container).toBeVisible();
         await expect(this.input).toBeVisible();