e2e ingest test broken by move of Run button

[philrz]

A failed attempt by our CI to advance Brim's Zed pointer reveals that the e2e ingest tests started breaking as of the merge of #2530. I was able to repro a consistent failure by running yarn e2e locally at Brim commit 124d658. A failure looks like:

1) ingest.spec.ts:50:5 › Ingest tests › query000: "* | count()" ==================================

    Test timeout of 30000ms exceeded.

    locator.click: Target closed
    =========================== logs ===========================
    waiting for selector "div[aria-label="editor"] + button"
    ============================================================

      49 |     const testId = sprintf("%03d", i)
      50 |     test(`query${testId}: "${zed}"`, async () => {
    > 51 |       await app.query(zed)
         |       ^
      52 |       const resultStats = await app.getViewerStats()
      53 |       expect(resultStats).toEqual(expectedStats)
      54 |     })

        at TestApp.query (/home/runner/work/brim/brim/packages/e2e-tests/helpers/test-app.ts:71:69)
        at /home/runner/work/brim/brim/packages/e2e-tests/tests/ingest.spec.ts:51:7

Looking closer at the test code, I can see that points to:

https://github.com/brimdata/brim/blob/124d658befab6d03d047a9617552fa291d2bb283/packages/e2e-tests/helpers/test-app.ts#L69-L73

So, it appears that middle await is still expecting to find the Run button in the editor, but it's been moved to the title bar.