Refactor code asserting asset's balance

Previous implementation wasn't properly handling cases when the assertion was
not met. In such cases it was silently ending the tests, without reporting any
failures (the failure was visible only in the Playwright report, which wasn't
opened by default).

e2e-tests/utils/assets.ts

@@ -78,15 +78,13 @@ export default class AssetsHelper {
      * Assert the token name and make sure the balance equals (or gets updated
      * to) the correct value.
      */
-    const activityLeftContainer = this.popup.locator(".left").filter({
+    const activityLeftContainer = this.popup.getByTestId("left_wrap").filter({
       has: this.popup.locator("span").filter({ hasText: assetSymbol }),
     })
-    await expect(async () => {
-      const balance = await activityLeftContainer
-        .getByText(/^(\d|,)+(\.\d{2,4})*$/)
-        .textContent()
-      expect(balance).toMatch(expectedBalance)
-    }).toPass({
+    const balance = await activityLeftContainer.getByText(
+      /^(\d|,)+(\.\d{2,4})*$/
+    )
+    await expect(balance.getByText(expectedBalance)).toHaveCount(1, {
       timeout: 120000,
     })