test: add array field helpers (#13493)

Adds various helpers to make it easier and more standard to manage array
fields within e2e tests. Retrofits existing tests to ensure consistent
interactions across the board, and also organizes existing blocks and
relationship field helpers in the same way.

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1211094073049046

test/helpers/e2e/fields/array/removeArrayRow.ts

@@ -0,0 +1,26 @@
+import type { Locator, Page } from 'playwright'
+
+import { openArrayRowActions } from './openArrayRowActions.js'
+
+/**
+ * Removes an array row at the specified index.
+ */
+export const removeArrayRow = async (
+  page: Page,
+  { fieldName, rowIndex = 0 }: Parameters<typeof openArrayRowActions>[1],
+): Promise<{
+  popupContentLocator: Locator
+  rowActionsButtonLocator: Locator
+}> => {
+  const { popupContentLocator, rowActionsButtonLocator } = await openArrayRowActions(page, {
+    fieldName,
+    rowIndex,
+  })
+
+  await popupContentLocator.locator('.array-actions__action.array-actions__remove').click()
+
+  // TODO: test the array row has been removed
+  // another row may have been moved into its place, though
+
+  return { popupContentLocator, rowActionsButtonLocator }
+}