Fix window enumeration/offline integration tests to match/wait correctly

Fixed:
* The offline install test case now takes into account the new Installer
  API behavior that successful interactive installs show a progress UI,
  but once the install completes, the `InstallerSuccessLaunchCmdLine` is
  launched and the UI closes automatically.
* The offline install test case now robustly handles waiting for the
  unsuccessful interactive install error dialog.
  * `CloseInstallCompleteDialog` was not waiting for a match, resulting
    in incorrect semantics.
  * `CloseInstallCompleteDialog` now exits early if a match was found.
    * `WindowEnumerator` stops enumeration early if a match was found.
* Removed the need to call `::WaitForInputIdle` in `Run`.

The `mac-updater-try-builder-rel` and the `mac-updater-try-builder-dbg`
bots have been in a `shard #0 expired, not enough capacity` state for
almost 6 hours now. My change is Windows only, so I'm bypassing these
bots with `No-Try: true`

No-Try: true
Bug: 1286574,1481314
Change-Id: I58336d05b703de9a2d60d0555fe9994836092e8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4862703
Auto-Submit: S Ganesh <ganesh@chromium.org>
Commit-Queue: S Ganesh <ganesh@chromium.org>
Reviewed-by: Xiaoling Bao <xiaolingbao@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1196338}