Allow reporting a room when rejecting an invite. (#29570)

* Add report room dialog button/dialog.

* Update copy

* fixup tests / lint

* Fix title in test.

* update snapshot

* Add unit tests for dialog

* lint

* First pass at adding a report room on invite.

* Use a single line input field for reason to avoid bumping the layout.

* Fixups

* Embed reason to make it clear on grouping

* Revert accidental commit

* lint

* Add some playwright tests.

* tweaks

* Make ignored users list more accessible.

* i18n

* Fix sliding sync test.

* Add unit test

* Even more unit tests.

* move test

* Update to match designs.

* remove console statements

* fix css

* tidy up

* improve comments

* fix css

* updates

playwright/e2e/sliding-sync/sliding-sync.spec.ts

@@ -255,8 +255,8 @@ test.describe("Sliding Sync", () => {
         // Select the room to reject
         await page.getByRole("treeitem", { name: "Room to Reject" }).click();
 
-        // Reject the invite
-        await page.locator(".mx_RoomView").getByRole("button", { name: "Reject", exact: true }).click();
+        // Decline the invite
+        await page.locator(".mx_RoomView").getByRole("button", { name: "Decline", exact: true }).click();
 
         await expect(
             page.getByRole("group", { name: "Invites" }).locator(".mx_RoomSublist_tiles").getByRole("treeitem"),