E2E: wait for view search message before unblocking

[shouples]

We have some tests flaking because they try to interact with a tree item (e.g. inline action hovering as part of clickInlineAction) before the search message has appeared in the view.

For example:

• item is hovered:

• tree view message appears, no longer hovering:

TimeoutError: locator.click: Timeout 30000ms exceeded.
Call log:
  - waiting for locator('.pane').filter({ has: getByRole('button', { name: /Topics.*Section/ }) }).first().locator('.pane-body').locator('[role=\'treeitem\'][aria-level=\'1\']').filter({ hasText: 'e2e-topic-message-viewer-053264' }).locator('.actions .actions-container').getByRole('button', { name: 'View Messages' })
  -   locator resolved to <a tabindex="0" role="button" aria-label="View Messages" class="action-label codicon codicon-confluent-view-messages"></a>
  - attempting click action
  -   waiting for element to be visible, enabled and stable
  -   element is visible, enabled and stable
  -   scrolling into view if needed
  -   done scrolling
  -   <div class="message">Showing 1 of 176 for "e2e-topic-message-viewer-05…</div> intercepts pointer events
  - retrying click action, attempt #1
  -   waiting for element to be visible, enabled and stable
  -   element is not visible
  - retrying click action, attempt #2
  -   waiting 20ms
  -   waiting for element to be visible, enabled and stable
  -   element is not visible
  - retrying click action, attempt #3
  -   waiting 100ms
  -   waiting for element to be visible, enabled and stable
  -   element is not visible
...